I believe the last Belfast is no longer in service with Heavylift, but would be happy to be proved wrong.
As far as I know, Heavylift Australia is still flying one Belfast which is based in Brisbane but registered in the Philipines as RP-C8020 (ex Hector - RAF Serial XR365, ex G-HLFT, then operated by Heavylift Australia as 9L-LDQ, and re-registered in the Philipines last year).
http://www.airliners.net/open.file?id=1202426
They're looking at bringing Southend's G-BEPS
(ex Theseus - RAF Serial XR368) back into service and I read that it had been rewired and three of the four engines refitted and tested. I believe it's just waiting for a serviceable prop for the fourth engine.
http://www.airliners.net/open.file?id=1192370
If you're a fan of 4 x Tynes, there's a thread in the Freight Dogs forum in PPRuNe regarding the CL-44O Guppy, currently at Bournmouth, that you might be interested in.
http://www.airliners.net/open.file?id=1250447