The triangular bugs in two of your photos are considered true bugs -Hemiptera- and they have stylet like sucking mouthparts to feed off of plant sap so you would consider these foes to be removed in a manner of your choosing. The beetle could be considered friend or foe but to that I cannot answer since this is a UK beetle and I am from the USA. Best Regards...WOW!!!...I have just noticed that you have been a member of GOY since 2007:)

The first two pictures just look like shield bugs to me, likely the different coloured one in the second picture is a younger version, since the pattern is similar, just more brightly coloured - they look quite different at different stages. The mature, final version is the green one, and it seems to be the common Green Shield Bug or Palomina prasina. Info here

https://www.rhs.org.uk/advice/profile?PID=519

They are essentially harmless to your plants.

The third one is obviously some sort of beetle, but its not one I recognise. If I find it I'll get back to this question.

2nd pic - try googling images of Dolycoris baccarum (Sloe shield bug).

3rd pic - try googling images of Cantharis livida (a species of soldier beetle).

Try spritzing them with soapy water or baking soda solution (Sodium Bicarbonate) They are up to no good and should be dispatched.

Shield bugs (the green ones) are not that common and I would prefer to leave them alone and enjoy looking at them. The few that there are do not do much harm.

Thank you so much everyone for all this information. So helpful and lots to read up about. Just wanted to know my fruit and vege are safe ! ☺

Shield bugs have never done any harm to my plants and I find them all the time.

The last one is one of the soldier beetles as said and as such it is a friend as it eats greenfly.

I too see lots of these shield bugs, never noticed any damage from them, I always leave 'em alone. If you're working in the garden, they quite often sit on your arm or hand, I just shake them off gently. And I agree the beetle is likely a soldier or sailor beetle of some sort, again, not an issue

You have 2 different species of shield bugs (green and brown) that affect plants differently. They are all sap sucking bugs that can't be good for plants. They can also carry/transmit various pathogens. They are also known as 'stink bugs'. They are invasive and can ravage your plants/crop. There is yet another species on its way to the UK from Asia.

They will also seek to overwinter in your house in high numbers and yes they do stink to high heaven if you squash them or try to get them with the vacuum cleaner. Once they invade your home (late summer), you'll need to call an exterminator and yes, your house will stink to high heaven. That's why they are called 'stink bugs'. They also lay masses of eggs on/around your plants. Those will invade your house next year.

'Stink bugs have the potential to spread throughout the country, which could be harmful to the agricultural industry, as they destroy crops. Although stink bugs are not known to bite humans, their tendency to invade homes in high numbers can be a nuisance.

Both green and brown stink bugs are pest species targeting mostly the southern parts of the USA.'

I've reference the following websites. Please visit them for more in-depth information.

https://www.pestworld.org/pest-guide/occasional-invaders/stink-bugs/

http://stinkbugsguide.net/

I've never had any problems with shield bugs and have always rather liked them. They have never appeared in the house.

Well, for the amount of damage they cause on garden plants, they're not worth worrying about, frankly - god knows, all kinds of insects are dying and disappearing in their thousands, the last thing we need is to try to polish off something relatively innocuous, especially using insecticides. Live and let live I say, unless there's a veritable plague of them during the growing season, which I've never seen in all my years of gardening, just the odd few here and there. That's one of the advantages of being in the UK, these are not a problem in our homes, ever - our damp cold winters mean less problems from such things - unless its slugs and snails.

https://www.rspb.org.uk/birds-and-wildlife/wildlife-guides/other-garden-wildlife/insects-and-other-invertebrates/beetles-and-bugs/green-shield-bug/

These are fairly recent arrivals to the UK I understand. I'm simply passing on the information from reputable sources. It's abundant. Your privilege to do as you wish. I don't want them in my garden.

These ones aren't, they're indigenous to the UK.... there is a newer arrival, forgotten its name its in one of the links I provided higher up this thread.

Yes these ones is. Esp the brown one in the picture above. Do a little research.

Ha ha - grandmother, eggs, suck... did the research already, just can't remember... another aspect of being old enough to be a grandmother I guess...

Most gardens both flower and vegetable are relatively are relatively small and eclectic and most of these pests will cause little damage. They do cause a problem if your living is to grow100 or more acres of the same crop thus resulting in great numbers of the same insect pest which can cause much damage to a cash crop. But everything is relative and I have seen gardeners go into a breakdown over seeing a single bug munching on a leaf and others think nothing of it at all.

That's a good point and I don't have these bugs nor have I ever seen one. But from what I've read, I understand each female will lay masses of eggs all summer long and they'll seek out warmer shelter once cold weather sets in. The real problems start when the eggs begin to hatch.

video:

https://www.youtube.com/watch?v=eNwHNYXSCGg

These must be American ones. Doesn't happen here.

I agree with you Strera, I find shield bugs all the time and just ignore them, too much panic about the odd bug in the garden - the only one I really don't like and actively try to dispose of is the Lily beetle, otherwise leave them alone, they are probably food for something else anyway.

Just do some research. I just handed you 2 websites plus a video! We know they came from Asia. Hello!

Longleaf's ID of the sloe shield bug (Dolycoris) is accurate... its becoming rare in the UK though, so not something to kill. Neither of the shield bugs pictured is from Asia, they are both native British ones.

The brown marmorated stink bug (Halyomorpha halys) already invading Germany and France, present in the USA for some time, originally from Asia, was said to be coming here back in 2014. So far it hasn't done so, as far as I can establish - and its more of an agricultural pest. It looks quite different from the two pictured https://www.bbc.co.uk/news/science-environment-29990334

Good luck. You can keep them.