It depends what you want to plug in (and how much is currently on your lighting circuit) - if it's just for a mains radio, aerial amplifier or something simple like that, then it should be fine, if however it's to run a high power appliance (big power tools, fan heater or something like that), then it will almost certainly trip the lighting circuit.
Other things to be careful of is if the lighting circuit is not currently RCD protected, then to comply with the wiring regulations you would have to install an RCD socket, as all general purpose sockets must be protected by an RCD.
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