...The second option is a concorde as it has a more swept back delta wing IIRC and has two of those mini-wings at the front (sorry I've forgotten their technical names)...
Here you go chap, I guess you've seen this already
Waddington Vulcan site
Simply the most beautiful aircraft ever made(with compressors for engines)
I think your right in that there's only one [Vulcan] left, I've seen it flying a few times now, Bournemouth airshow have it every year, it's an amazing sight, ridiculously loud, awesome to watch, a great shame but its not going to be around for much longer I feel.
Paul it might help if you nip onto paint and trace what you remember of the out line, pick out the main bits and fill in the rest, also when you say dangling beneath itwhat do you mean, aircraft other than helicopters rarely have things dangling, could it have been a sentinel EW aircraft?
Also some chaps have some very strange private jets lately, could be worth widening you search,
I vote for Project Aurora! But then, i do like a good mystery.