The website only mentions sea salted caramel and raspberry cheesecake. I believe they also do brownie & vanilla and there might have been some of that too but to be honest, they had me at salted caramel.
Currently £4 in Tesco and £2.50 in Sainsburys. Seen in Heron in Hedon, East Yorkshire
Edited to add: went in to Heron again this morning and there was definitely no brownie & vanilla so it looks like it's probably just the two flavours they mention on their website.