Here is my son's bike we bought back in 2020 from Cycles UK in Maidstone. It has had a new back wheel and tyre as well as a new rear derailer. It was used by him to commute back and forth to school. It has a normal amount of wear and tear for a bike of this age, the paint has faded a bit and the saddle has become sun damaged through exposure.
It is sized small and I am sure you can find the exact dimensions online for the bike, but my son used it from school years 7 to 11 if that is helpful.
I can send this bike via a postage firm but I will need your exact postcode to give an exact price, from the research online this will cost around £40 to £50.
You are welcome to pick the bike up from Bearsted, Maidstone, Kent.