From the price you paid I hope you got a pro version with metal tracks. If not i'm sorry to say you have given them 50 quid for nothing!!!! The Leo is available from one of the recommended vendors here for about 135GBP delivered.

I recommend you look through the vendors section here, especially the blacklist, before parting with any more money. This hobby becomes expensive, so saving where you can means more tanks can be bought!!

I was going to get a HL Leo, but by the time I had done all the mods I wanted to do it became more sensible to pick up a built Tamiya.
So that's what I did .... I don't regret it. The sound of it alone is worth the premium. Then there's IR battling, better lights and working break lights, barrel recoil... rdr's has even more....
Anyhow you have come to the right place for getting the best out of your HL.