Mimulus guttatus (Common large monkey flower) my thanks to Dawnsaunt for the seeds I now have lots of them around the garden and very cheery they are.

They're lovely flowers. They grow wild along the river here.

Lovely - I didn't know there was a 'large' version

Neither did I Sheilar...always thought there was only the tiny little ones!

That must be a pretty sight Hywel.
I think I have this one right Sheilar? its a is a yellow bee-pollinated annual or perennial herbaceous wildflower that grows along the banks of streams mine are around 78cm tall. There are annuals, perennials and sub shrubs (both annual and perennial forms occur throughout the species' range). They can be up right or prone.

The leaves and flowers certainly look like mimulus! But the ones in your pic are definitely much taller than the little ones I've had in the past

They can vary in size from 10cm-80 cm. I have short and tall one Sheilar.

Yes it is HB