Need help installing a light switch at home

Hi there, I recently moved into a small flat in the UK and need a qualified handyman to install a new light switch. The old switch plate is already removed, and I have the new switch and faceplate ready. I’d like someone who can ensure proper wiring, safety compliance, and a clean finish. I’m hoping to schedule this on a weekday afternoon, and I’m flexible within a couple of hours. If you have a tidy workspace and can also advise on any potential upgrades, that would be a plus. Please provide a short note about your experience with electrical fittings and safety checks.