There are a number of Sunderland variants in existance (I am sure its 8).
3 in the UK: === 1 at Hendon, 1 at Duxford, 1 in Southampton
2 in USA === 1 at Polk City, Florida, 1 in Oakland, California
1 in France === 1 in Le Bourget (currently being extensively restored)
2 in New Zealand === at MOTAT Museum, Auckland, New Zealand
Strangely, none exist in Australia where they were extenively used post-war.
But ours in Southampton is the best, of course. Let me know by private message when you come down to Southampton and I'll personally give you an internal tour and a visit to the flight deck. I spend most of my weekends dropping peoples jaws as I guide them around our Sandringham.
Ours is ex JM715. In our museum as VH-BRC, a MK V Sandringham conversion.
SolentSkyMuseum
Here is a recent pic I took.
As far as I am aware of the 8 remaining variants, 3 in UK, 1 France, 2 USA and 2 New Zealand ours is the ONLY one where we not only allow the public on board, but if they behave, we will take them onto the flight deck. I have had people speechless, in tears of emotion and completely overawed at the visit.
As an added personal bonus I actually flew in ours when it visited the Solent in the 1970's. A stunning memory.
Cheers
trevor