I have read an article warning borrowers about the pearls of taking 5 and 10 year fixed rates with high early redemptions penalties (ERP).
Read here if interested. http://www.telegraph.co.uk/personal-banking/mortgages/beware-fixed-mortgages-high-exit-fees-brokers-warn/
I agree with the article that a degree of caution is require when selecting a long term fixed rate. A lot of customers may think that they will be staying put in their homes but what if there is a big job promotion, a job loss, or more children. Anything could happen and customers should considered some of the long term fixed rates without a large ERP.
Speak to your broker before you make a final decision