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Not sure about any additional safety features in the 2005 models,

ABS and Passenger airbag were options throughout the range, so look for these.

Also worth looking for four pot front calipers which give a marginal improvement in praking performance.

I would advise buy the latest and best condition car you can afford, with as much service history as possible.

VVC engines are more powerful and trophy/limited edition cars are likely to hold their value better

Nothing is certain as cars are at least 17 years old so do all the usual checks on cars of this age.

Head Gasket is not a myth, but if maintained shouldnt be a big concern. Not too expensive to replace, as long as caught before damaging engine.

£3000 should buy a really nice car, but £1500 can buy a very decent car. Under £1000 if you dont mind getting your hands dirty