The logic of some PCTs is very hard to follow - changing between generic PPIs, using branded generics and using ventolin as it is cheaper than the tarrif price for salbutamol inhalers.
Regarding switching of ACE inhibitors there is some information on NeLM:
http://www.nelm.nhs.uk/Record%20View...aspx?id=574588
but I agree with Titch, it makes more sense to review sartans.