Families do better with fewer bases. This plan keeps London, York and Edinburgh and ignores the urge to add Bath, Oxford and Brighton on the same suitcase.
London — two or three nights
South Kensington for the Natural History Museum and the Tube; Bloomsbury for the British Museum and quieter evenings. Avoid Zone-fringe bargains that eat an hour each way. London stays · London activities.
York — two nights
Walls you can walk, the Minster, and the National Railway Museum beside the station. Inside-the-walls hotels mean naps without a taxi. York stays · York activities · London–York train.
Edinburgh — two or three nights
Castle as a timed morning, parks and the Mile after. Skip Festival August unless that is the trip. Edinburgh stays · Edinburgh activities.
Ask SkyStay to shape a family UK trip UK planning hub
More UK plans: 5-day England · 7-day Britain · rail travel guide.