Likely 40 quid roughly for a light and a connecting box, if the wiring there existing is good to go plus, would quess someone would want fifty quid to come round.
However location matters, regarding parking, congestion charges, diesel surcharge, tunnel, tolls and any other extra costs
That is exactly RF’s point. Impossible to price something like this without actually seeing it.
Get a couple of quotes from your local, friendly electricians.
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