Q.Can A Mature Acer Be Moved?
When moving house 10 miles within Surrey I would ideally like to bring my beloved Acer- approx 25 years old, 7 feet high, 50 foot circumference?

Certified GKH Gardening Expert
This tree does not do well with moving. This is, especially, true when it is already established. It can be done, but I would seek the assistance of someone in your area that has experience moving existing Japanese maples, specifically.
I can offer another solution, however. Taking a cutting during dormancy (really several cuttings so that you can be sure that you get one tree to survive) can help you to move a smaller tree. You can opt to let it grow on its own, slower, root system, or graft it to a faster maple species as a root stock.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/moving-mature-trees.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/layering/air-layering-plants.htm
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-grafting.htm
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care.htm

Thank you for your very helpful advice - now need to find an Acer expert in the UK, preferably London area