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Quote all that I said, not just one bit.
Do you have a friendly sparky? If not might be worthwhile to get a check or a test done to see if there any faults on the circuits. At a guess for the garage you will want to power a couple of KW safely so probably adding a new separate breaker...then running an armoured cable out to the garage.
Understand the adding a separate mains breaker is major work, but can you get away with just testing and certifying cabling to the breaker and replacing the cabling that was there with 'like for like' or is the sparky want to test and certify the whole system.
lynx
Well...
Need to know the loading for the garage for size cable and voltage drop, need to know the main earthing arrangements from the supplier, need to figure if to use a catenary cable suspension / Hi-Tuff wall mount / armoured in a trench, need to fit a sub-main consumer unit with RCD protection on all circuits in garage, need to retest whole system as it's not classed as minor works...