It is the Supermarine 508, precursor to the Scimitar!
Kitbag is correct and has requested an
Open House 
Confession time!! I did check Mel's list before posting, and it wasn't in the block of Supermarine types, but I didn't spot the entry under Vickers until it was too late. However, as neither the poster or the winner have been on the forum lately I let it stand
