This place is amazing! I have a bike which I regularly take down to service. They have the tools and the expertise and will guide you as much or as little as you need when repairing anythign on your bike. What an amazing idea. They ask that non-members donate between £2 and £10 based on how much help you’ve had, plus they have spare parts to sell you(lots of secondhand components, and they’re not for profit so everything is extremely reasonable). Really well kitted out and nice, welcoming volunteers :)