Seems to be their policy not to now. The prototype HST power car was loaned to the 125 group, who did an excellent job of restoring it to working order (it needed a huge amount of work). THe NRM treated them extremely badly subsequently, and it's now back as a static exhibit (it needs some minor work doing, which the 125 group would have done, but is not far from in working order). After that, and the situation with the museum's resident diesel group, any preservation group is likely to be extremely wary now, even if the NRM were to change its stance.