Thanks for both your replies Sharon and Trevor. I don't get any special consideration due to bereavement so I need to find a cheaper version of Sage in order to take the final exam.
So far I haven't had any luck on EBay, there seem to be a lot of people after Sage 50 but after speaking directly to ICB they said it doesn't have to be the exact same software as the one sent by my training provider, it doesn't even need to be Sage as long as it has the same functions, but I will stick with Sage as I'm already familiar with it. I think I'll look for Sage Instant Accounts (like you suggested Trevor) and hope its not too different to Sage 50. Wish me luck!