It's a Mimulus, a lovely bedding plant that is relatively short lived. It will almost certainly be finished flowering by the end of August unless you dead head it, keep i well watered and feed it weekly

Thank you

I have had a minibus just like yours growing on the waterfall of my pond and it has returned for the last 3 years or more, could possibly be a seedling but it's a lovely plant.

There is a perennial variety which grows in wet conditions...it can spread a bit too by seed.

It's done well even after the gigantic hail stones hit it last week. I thought it would of been torn apart tough little plant. Thanks for all you answeres