I need some expert advice here and would be grateful for any info. My brothers 2 year fixed rate buy to let mortgage is coming to an end in 4-5 months. Is it too early now for him to start looking for remortgage possibilities? With interest rate quite low, he'd probably be better off w/t a fixed rate. But no one knows what tomorrow will bring, so he wants to see what fixed rates are available and when he should seriously start thinking about it.

Mortgage process could take 6-8 weeks to complete, so 2 months in advance is probably sufficient. However, make sure that you don't complete before your fixed rate expires, to avoid early repayment charges.