What a pair of clowns! Spending money on lawyers will only increase the cost dramatically. It's a classic case that they should pay half each just to get rid of the thing. But I guess no-one's keen to shell out £20k for a short day out.
However, the real question is whether Piper can prove a full "you bend it, you mend it" agreement and that the £2,000 deposit wasn't the maximum recoverable.