Most tyre appointments take 30-60 minutes for 2 tyres and 45-90 minutes for 4 tyres. This can change depending on a garage's schedule and if any add-on services are desired. Wheel balancing, valve replacement, etc., are all add on services that take time.
If the Blyth garage has stock and a garage spot available, next day fitting is definitely possible. Just search for your tyres and move on to the booking stage to see what the earliest spot is on your selected tyres.
Mobile tyre changing availability may vary based on partners available and the day. Once you have selected your preferred tyres, check for availability of the mobile service.
The most convenient way to find the right tyres for your vehicle is by searching the vehicle registration. For alternative means, you can search for tyres based on their size and brand as well as your desired price and type considering your driving style and the local roads around Blyth.