They look like Lupin.

They're not Lupins. Neither the flowers nor the leaves look like them.
I don't know what they are, but I do know they are not Lupins.

Possibly isoplexis canariensis?

I agree with Andrew.

Thanks all for your comments, andrew I've just googled that and it does look like it thanks :))

It's lovely! :)

It was on glorious gardens from above at Hidcote :)

I think that's where I first saw it - they have been growing it there for several years.

Thats an episode I've yet to view. Got them all recorded!