In order to make progress on the sitting room, all the services need to be in place before we can lay down the insulation. Day 1 was electrics; Day 2 is the plumbing. (Day 3 will be wiring for the TV.)
Lessons learnt:
Make sure you identify all the items that are stopping you from making progress [...]

The first step of the plan has started with emptying the Garage and Sitting Room for the following reasons :-

Electrics & plumbing for the utility room, sitting room and extension.
Insulation under the sitting room, utility room walls & ceiling.
Changes required for the wood buring stove.
Plumbing changes for future rain water harvesting.

So when planning the changes [...]

So far, its been intensive planning and lining up the various trades. The video below gives a quick summary.
However, problems on the planning permission front. Take a look here