As I said on the "other" forum, this could be quite complicated legally as there are usually easements which may allow the gas main on your property.
It may also need to be relocated so other homes can be built over land where it currently runs.
Getting utilities to do anything out of the ordinary can take forever.
With every stage from getting a price, quote, payment and then anything from 6 to 10 weeks before they even start!
Taylor Wimpey have a duty under the
Consumer Code for Home Builders to keep you informed of anything likely to delay completion and give accurate and realistic completion dates. It would seem they have breached these requirements and may have a case fore a claim.
Click on the above link and follow page links to find out more. If you were not given a copy of the Code, that is a breach of requirement 1.2 for a start!
Labour and material shortages should have been allowed for when the completion date was programmed and given to you. It is hardly new or unexpected!
How is it that a proper construction company can build something like The Shard in London and hand it over not just on time, but in some cases early, yet a large house builder often cannot build a house in 16 weeks.
Likewise the electricity connection and meters.
True they want notice as I said earlier but a good site manager would plan for the connection and meter installation weeks, if not months in advance.