not sure what you are after in a terms of an update? It all depends on who your insurance is with and what it covers and if UK holidays are covered.
For example the post office travel insurance:
Even if you're staying in the UK for your break, having holiday insurance will provide cover for lost, damaged or stolen possessions such as baggage, and cancellation, cutting your trip short or delay to your trip in some circumstances.
I just know that my bank's holiday insurance covers trips in the uk as well under the same terms of if it was an holiday aboard. Yeah you don't need medical cover but at the same time you may not need medical cover aboard if you have GHIC or EHIC...