This behaviour is kind of inevitable if sellers say they only want offers from 'proceedable' buyers though. You have to have agreed to sell to view somewhere; what are you supposed to do if you can't then find somewhere you like?
It's not sellers currently putting this in place, it's pretty standard for every agent I've dealt with at the moment. This is the situation I'm in, couldn't view/secure anything until we were under offer, now under offer there's bugger all suitable about.
This behaviour is kind of inevitable if sellers say they only want offers from 'proceedable' buyers though. You have to have agreed to sell to view somewhere; what are you supposed to do if you can't then find somewhere you like?