I had a similar problem with an RC heli I sold on the bay...
Sold it to a chap, then he rings me the next day saying he had crashed it as it didn't fly straight and it was my fault as I had sold him a dodgy heli...
He then told me that he had spent £70 on replacement parts and he wanted me to pay for it!!!
Needless to say... I didn't pay him...
I think you are very generous to pay £10... but sometimes needs must....
Losi looks very nice in the ad though... well worth £150!