Rattle and squeak sound coming from the engine

Rattle sounds like it could be a loose pulley or a bad belt tensioner bearing. Should be easy to find. Take a piece of hose or vacuum line and put one end close to your ear, move the other end around to the various moving parts and listen for the rattle to increase as you get near the bad part. Just watch those moving parts.
You can use a similar trick with something like a rod or screwdriver with your thumb over the upper end and right against your ear to listen to non moving parts (like the bearings in the alternator, power steering pump, camshaft) Or buy a mechanics stethoscope to do the same thing.

The squeak sounds a lot like a brake pad wear indicator. You can hear it squeak as your driving as the caliper moves around and causes it to hit the rotor. When you step on the brake it gets much more pronounced and solid in tone.

Please reply back if you have questions or determine the cause(s) of the noises.

Honestly I do not know what the labor and parts prices are in Worthing.
I can tell you that in the US the brakes would run about $300.00 to 400.00 if they replace the rotors, pads and do a fluid flush. The rattle is not easy to say. If it is something easy to deal with, maybe $200.00 between diagnostic and repair time. If on the other hand it was something like a timing tensioner or internal engine component it could be considerably more.

You could save some money if you did the brakes yourself, they are actually very easy.
https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd
for an overview of the process.

Sorry for the vague answer.

Good deal. Not sure on the squeal. Normally that would be constant but it could be. Post back with the result and thanks for using 2CarPros.

Great to hear. Sounds like you found an honest shop as well.