Thanks guys.
I hadn't thought of renting a FLIR camera and it seems my local HDepot has them. Thank you for that tip. I must admit that I had a nightmare last night where I did all this work and the heat was still going out through the roof! I woke up and couldn't get back to sleep so I watched yet more videos on how to place baffles.
I'm still not totally there on the baffle installation yet. The term that I was looking for in my first post was "top plate" and I think I will need to seal this. I've read various options -
1. caulk/seal along the top plate with something like great stuff pro? Then use a fibreglass batt on top and pushed next to the baffle to stop insulation getting in?
2Place a piece of rigid foam on the top plate butting up against the baffle and caulk? Would I need to seal the top plate first? like in the photo I've tried to attach.
I'll take some photos of my attic in a couple of hours and post them.
I'm wondering about a time frame to do all this? I have ordered the can light covers and they will be here next week. I'm waiting for the diy/drywall guy to tell me when he can come to remove the fan, but I imagine next week at the earliest. In the meantime, I can crack on with the baffles, Ihave no idea how long that will take, it will be a pita to get those baffles in there due to space restrictions. I thought of getting a staple hammer from HD - any recommendations or does it not matter?
http://www.homedepot.com/s/staple+hammer?NCNI-5My daughter and I will make a cover for the attic hatch ourselves. Construct a frame around the opening and have fiber batt insulation place around it then make a top from insulated rigid foam with a batt glued/stapled on top, bit of weatherstripping and bob's your uncle as we say in the UK! Anyone else done this?