Wait and see what the mortgage approvals are in May and following months. This reduction will feed through to the market with a dampening effect.
There may be an initial dip if, for no other reason, than all parties involved need to get familiar with the new processes brought into play.
Regardless, if there is a bigger dampening caused by greater diligence being applied to lending, then I'm not sure anyone can claim that's a bad thing. You yourself US are predicting rate rises and it can only be right that those taking out new mortgages are believed to be able to cope with that when it comes.
All that said, my new mortgage, being taken out through an IFA similar to yourself, seemed to be a complete breeze. I don't think I was asked any more than I have been prior to these changes.