Sounds like purple leaved Oxalis, give it a google see what you think

I thought the same Dido, I have some, there lovely.

sounds like Oxalis and this spreads like wildfire, don't let it get to the seed stage cos as you pull it up the pods ping open and shoot seed everywhere!!!! Also get the roots out as they are quite deep. I have this stuff and pretty as it is , it is also very annoying grrr :/

If anyone wants any, I can supply. Just let me know how many buckets full.

Ha ha you make I laugh Bulbaholic :)))

Get rid of it if you can. Don't be fooled into thinking it's pretty unless you want it everywhere. I speak from experience. I think I even admired it in someone else's garden!

And I was fool to plant it on purpose! 10 years on and a change of address and I still have it popping up here and there.

I keep finding it in my garden this year - I think one of my neighbours must be cultivating it :-(

I didn't realise it could follow you to a new house! That is a clever weed.

Well I did hire a separate van to bring all my plants, so it was probably stowing away in one or two of the pots. Or it may have run behind the van...

Thanks guys, yup that is exactly what it is. Unfortunately I've had a few of those pod things go pop...it is very pretty but just won't go away lol