A Peckett, a Sentinel and perhaps a pack of suitable wagons for each. All in liveries that will stay unique to club members and at prices that make it worth being a club member with a voucher. Thing is, they don't have to have a huge variety of items, just stuff that people will want and not reliveries of generic trainset stock.
Problem is that if they have this stock sitting on the shelf, turning over relatively slowly, then when there's another panic the beancounters and stock checkers will sell them off to the retail sector to raise some wind, like the Hornby 2016 Hopper, etc, etc.