When I lived in Hampshire, at a local railway society, there was a discussion about 34102 Lapford and one member said that when it was withdrawn, there was already a preservation group interested in it but outbid by Buttergieg's. After talking with BR, it seems that they were happy to let Buttergieg resell it to them and Buttergieg were happy to oblige (obviously they were going to make some money with the added bonus of not have to do any work plus saving the cost of the gas).
The agreement was that they had to pay a deposit and then pay the balance within a agreed time, so when 34102 arrived at the scrap yard, it was put to one side but there's a but. From what the member said, Buttergieg asked numerous times for the deposit and when it finally arrived, it bounced! So they lost patience and the rest they say is history.
Julian Sprott