Ideal three contract offer - £100 cash in hand. ?

I have a three mobile phone contract for sale which has 12 more months remaining. All previous bills have been cleared out. The plan includes:- - 1GB of mobile internet - 5,000 3 to 3 minutes - 5000 texts - 150 picture mail - 500 voice minutes. I want to sell this contract ASAP as i will be leaving the country soon. I will offer £100 to the buyer, for buying this contract. This will reduce the contract payments to only £19 per month, in addition the buyer will also have a 12 months contract instead of 24 months. This will be highly suitable for a student. Thanks.