Was looking for a quick check for my bike... At the moment Halfords is doing a free one. It's not a comprehensive one, but if you don't have major complaints, it's great to make sure that your bike is safe to ride.
The check covers the following areas:
- The handlebars
- The wheels, tyres, and hubs
- The drivetrain: the gears, chain, and bottom bracket
- The brakes
- The saddle
You can also check if your council does Dr. Bike events, but they only happen once or twice a month (if at all).