Looking for components for your projects? I recommend two UK-based suppliers
Bitsbox are an excellent choice for general electronics components – for example LEDs, resistors, capacitors – as well as related hardware including breadboards, mounts and headers. They have a low, fixed, postage fee and the components arrive almost before you’ve placed the order. Excellent service and superb value.
If you’re just getting started, consider their Electronics Starter Kit which is excellent value and contains everything you’re likely to need for your first few projects.
There’s a lot of crossover between Bitsbox and Cool Components but whereas Bitsbox specialises in general purpose components for all electronics projects, Cool Components includes more project-related modules such as sensors and kits for both Raspberry Pi and Arduino.
Proto-Pic is the place to go for the sorts of components you’d need for microncontroller (eg Arduino) projects – for example robotics and weather stations. The have a huge range of parts including sensors, converters and breakout boards. Service is excellent and prices very good.