I purchased them from a discount store pretty late in the season ,april time, then done a little research on them. Have managed to grab a few seeds for next year from the same place as they don’t seem to appear in any major seed house catalogues in the UK , but they are available for a place in Anglesey ( An island of the coast North Wales where Prince William flies his search and rescue helicopter from ).
The flavour is very good the grandchildren ( 3yrs & 6yrs ) like picking them and eating them , so they must be good .
See link :
http://www.medwynsofanglesey.co.uk/shop/prod_354.html