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Fuck the main dealer off.
Pay for the service, assuming they did it (rookie error taking a £4k car to a main dealer for a service), then take it to a local place that knows what they're doing.
Tyre + clutch + boot seal can't be more than £400
Oil leak - have you been checking the levels regularly? If it hasn't really been going down on the stick then I'd say leave it. Oil leaks look worse than they are, a blown rocker gasket will cover a block in oil and crap will get stuck to it making it look horrific but it's probably only 100ml every 1,000 miles. If you haven't been checking it then start checking it and report back.
Just got more from Mrs Sparky. Clutch needs replacing. Boot seal is leaking and boot carpet sodden. One tyre badly worn (was okay recently so maybe a result of misalignment from the incident) and also this mystery oil leak. Estimate is £1,700 plus whatever they find in engine bay that's causing leak...
Doesn't look good.