53 Neptunes MR.1's were delivered some were written off in accidents(6), WX510 crashed at sea to the west of Barra, WX511 crashed at Kinloss, WX545 crashed on the Mull of Kintyre and is still there to this day some 600m from the Chinook crash site. A quick look at the AB serials shows that most were either struck off charge (12) or sold as scrap(13 on the 14-11-1958) with the remainder being returned to the USAF for use by the Brazilian Air Force(14) or the Argentine navy (8). I would assume that the aircraft struck off charge would be scrapped as well.
Sure I have seen photo's of RAF Neptune's in a scrapyard over on Key Publishing Historic forum under "scrapyard photo's".
International Alloys, Aylesbury
2/3rds down the page photo has 4 Neptunes ex Silloth although I can't see them for all the other scrap.