They want access to the house to replace the pipe to our gas meter too but no idea when.
There are big reels of 3 inch ish yellow pipe laying around in various places. They have been camera surveying the existing mains I'd guess to check the liner pipe will pass ok.
They set up the camera and screen right outside and I had a front row seat. I'd say the pipe was 1/3rd full of debris. sometimes the screen went black as they ploughed the dust with the camera.
Thames water have been around at the same time fitting water meters in the pavement. They cut the hole edges with the pneumatic drill. When the last guys came along to resurface at the end they diamond cut the edges clean before asphalting.