Just run some power to the garage not expensive.
What is the distance including going down from the house fuse box and add on the distance to the garage what size is the garage.
You should be able to do it for about say £200 and that sorts a lot of problems.
Although I certainly agree that getting mains power to the garage is something that should be highly recommended, I think you may be being a bit optimistic here Eddie - have you seen the price of SWA lately?
Remember also that work like this has to be certified and inspected, and if it involves replacing the consumer unit - to add a new RCD/MCB for example - then the whole house has to be inspected, and any deficiencies must be fixed before work can be done.
We found this out when we had security lighting installed, I nearly had a heart attack when the electrician told us he had to test the wiring in the house first. Not normally a problem, but in our ancient cottage, that had been rewired more than 40 years previously, it was a different matter. Fortunately the wiring passed, so we were ok.
