Just saw this on Gumtree. I've no idea what the design is but I've asked the advertiser for the sail number so (assuming I get a reply) all should shortly be revealed...
 
https://www.gumtree.com/p/boats-kayaks-jet-skis/merlin-rocket-sailing-dinghy/1184635309 

2919 apparently - I haven't got a yearbook to hand to find out more. The seller says someone has already given him a deposit (on £150? What a cheapster!) Hopefully she'll be repaired rather than stripped of rig and fittings before being cremated. We'll find out soonish I guess.

  I'd suggest that there is rather more going on with this boat than the seller is letting on. The gunwale on the far side is hanging off so who knows what the rest of the deck is like?
 
Doesn't look good for it really 

Its a Hornblower, nice oldie if it could be repaired