Seems like an interesting scenario. RT sells a car needing a restoration to Wheeler Dealers for 13k, gets approx 8k's worth of work done on it and then buys it back for 21k. Puts it on the market for 21995.
Seems to me like everyone comes out a winner. RT makes a nice profit, Wheeler Dealers make an interesting TV programme, and some buyer gets a reasonably well restored car with an interesting history for 22k. Sorted.