I don't know! I think you're attributing far too much brains and forward planning to banks, a lack of both was more the problem.
Customer could just switch at the end of the 5 yrs if they upped it to 150%.
Thanks so much for your opinions. Other banks seemed to have been very clear on what options you had at end of the fixed term. EBS just said applicable variable rate then prevailing. How can I ensure our case is included in the review?