Scott Lodder did a triple threat airbrush comparison here a few months back:
https://armorama.kitmaker.net//features/2365The Premi-Air G35 looks to be a great starter airbrush, costs about $50US, and is available in the UK.
For the compressor, try looking at the nearest home improvement super store. If you have Harbor Freight in the UK, look there. You can usually find a cheap compressor for $100US or less. Keep in mind that you need to regulate the air pressure going to the airbrush down to 10-35 PSI. Some compressors have a pressure regulator built in. For best results, you also need a moisture trap. Again, some compressors come with traps built in.
Typical setups:
Air Compressor ---> Regulator ----> Moisture Trap ---> Airbrush
Air Compressor ---> Moisture Trap + Regulator ---> Airbrush
Air Compressor ---> Regulator ---> Moisture Trap + Regulator ---> Airbrush
Some more info:
- you do not need a special air compressor to run an airbrush, but avoid tiny units--they cannot keep up resulting in airflow fluctuations
- some moisture traps also acts as regulators
- it's okay to have more than one regulator in the air path, such as one right out of the compressor and one at the moisture trap
- you can buy extra pressure gages and stick them anywhere in the air path. Good places for pressure gages are at the air tank and right before the airbrush.
- you can run without a moisture trap but expect a temperamental airbrush!
- air compressors can be loud; if an issue, look for a quiet one or build an enclosure (an ice chest will do)
- you may want to consider the warranty on the compressor (a risk with cheap compressors)
- for comfort, connect your airbrush to the system with a braided line (not required but nice)
Typical places for pressure gages:
Air Compressor --> Pressure Gage --> Regulator --> Moisture Trap --> Pressure Gage --> Airbrush
Air Compressor --> Pressure Gage --> Moisture Trap + Regulator ---> Pressure Gage --> Airbrush
Air Compressor --> Pressure Gage --> Regulator --> Moisture Trap + Regulator --> Pressure Gage --> Airbrush
Do not be afraid to ask someone at the hardware store for help.
Good luck and if you have more questions, please feel free to ask!
-Doug