Thought I'd update the thread, had the door fitted now, they did an OK job, not overly impressed with the cracks in the wall, think they could have been a bit more careful to avoid that but there we go, seems to me it cracked where they drilled it to get the strongboys in, they also drilled everything from the inside which is why there are a series of render patches up the each jamb, I would have though either drilling from the outside in would be less destructive though I'm unsure why they even needed to drill the holes on the jambs at all? I had to lend them my Rivet gun so they could attach the security strips properly, they were just going to silicone them on, also I'm kicking myself for not saying I would apply the silicone seal between the door/masonry, its functional but looks like my boy did it. I'll build a little step now.