Wasn't it RAMCO who disposed of the Pye Museum's holdings a couple of years back after the sad demise of its founder? ISTR an ad in the back of Practical Wireless..
As an auction-site, Witham SV -
http://www.mod-sales.com/ - is also worth keeping an eye on - in times-past they've disposed of pallets of Clansman radio-gear at stupidly-low [priced-by-weight] hammer-fall prices.