I managed to get the new belt on and there is no squeak or anything so seems fixed upto now. =D

I will be checking now and then as the temp outside gets cold so see if it returns.

But I also got a quote from a garage about getting pullys replaced if needed and the quote was £70ish. Sounds fair?
Ofcourse wont need to get it done if the sound doesnt return.

I'll say thank you all, in advance if it doesnt return =)