plenty of frame fixings, then foam any gaps, make sure its level before you fix anything, lots of old frames were warped and twisted so dont just bang it in to the old opening and expect it to close properly !! also make sure the door panel is toe and heeled properly to stop it sagging and then not closing !! pack out the bottom corner on the hinge side and the top corner on the latch side, this acts as a diagonal brace to stop any dropping of the door framing
http://www.malbernwindows.co.uk/trade/fitting.html http://www.malbernwindows.co.uk/trade/glazingreqs.html http://www.malbernwindows.co.uk/trade/toeandheel.html