The Revolution TEA is a model of a prototype of fairly recent construction; what acg5324 means is the 60/70s version that the Poole one is based on. A new one is a must--as is the PGA hopper (loads of liveries, hauled by many locos etc etc; a lots of modellers would buy lots, as they ran/run in block trains.
I also reckon the PTA/JUA aggregate/iron-ore tipplers (how about scale rotary couplings?!!!) would sell well for the same reason. I know kits are available from TPM, but RTR quality is what is required today (IMHO).
I also agree with acg on the Carflat and the ferry van (assume he means the VIX).