We’re due to remortgage soon, and start paying nursery costs in the same month, currently we pay £500 per month and owe £90k at 2.99% with 20 years left - We’re considering fixing the term for 10 years at 2.65% because I can only see rates going up.
Hard to compare mortgages with other people as everyone's situation is different and so many factors affect what lender or rate is best for you, not just the BBR at the time. Your best bet is to see a local whole of market broker that will talk through your situation face to face (ideally one that wont charge a fee, they are around and NOT just the national one that is often mentioned on here) and get you a deal that best fits your requirements.
Personally I am on a five year fixed which we took out about eighteen months ago to see us through Brexit and any turbulence in interest rates that might happen through the process. We are also making small overpayments to try and reduce the term.