I think it might be Borage - maybe someone else will have a better idea.

Yes Borage...

yes Borage officinalis, the flowers are edible and make a pretty addition to salads. the young leaves taste of cucumber but the older leaves are too prickly. it will self seed easily but they are easy to pull out.

Ooh, Pims o'clock - lovely addition to the drink.

I knew they went in a 'posh' drink but couldn't remember for the life of me which one. thanks camomile :o)