It is indeed the Supermarine 322 "Dumbo"
Apologies - I'd forgotten the special meaning of "tricycle" when I answered Zaxis - I just thought - "yes three wheels"..............
I shall sit in the corner with a dunces cap on for an hour.................
Amazing that it took several years to actually reach first flight in 1943 - so much pressure on Supermarine to crank out Spitfires - which, to be fair were war winning whereas the 322...... was unlikely to trouble the history books