Honestly guys DO NOT BELIEVE any 5 star review on here it's fake.
I have just submitted my small claims court form after not receiving my iphone back after rejecting their significantly reduced offers.
Let me tell you about the process:
1) they offer you a great price
2) you post out your phone
3) they make up damage to your phone and offer you much less than quoted
4) you either accept (AND NEVER RECEIVE THE MONEY) or reject
5) If you reject they will tell you the phone has been posted out
6) if you call you will either speak with MATTHEW or GRACE they will tell you Royal Mail can take up to 10 days.
7) You call back and wait 1 hour for them to answer. They tell you a manager will call you back.
8) They don't EVER call back so don't hang up.
9) Sometimes Grace likes to put you on hold and then hangs up (she loves that trick)
10) You either give up and let them have your phone for free or you make a claim
I recommend the latter. Google "small claims court" and press on the gov.uk website link. THEY WILL PAY UP IF YOU DO THIS