Inadequate frost protection for starters. As they've skimped on that, it would make me question what else they've not done to regs, underground pipe needs to be minimum 760mm deep for frost protection, and if you intend to bring supply up and through the wall externally, the Groundbreaker Insuduct is the correct method, the insulation on that is to the required standard to protect the pipe.
It looks like the house has wooden floors so it would have been possible to drill through from the trench for an underground entry. This would have been more work, and more disruption, but a proper job.
Replacement water supply pipes are supposed to be inspected by the water company or laid by one of their approved contractors. IME (not much) they are quite hot on correct depth.
Ideally there would be an internal mains stop tap, invariably they are located in the space under the kitchen sink - usually looking like or similar to this -
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local