The 2.0 hdi Relay has a service interval of 12500 miles or 12 months, that normally means you’ll be needing a service once a year.
Timing belts need changing at no later than 10yrs or 100K miles but ideally at 8yrs.
Tyres tend to perish before you get a chance to wear them out especially the original Michelin tyres. Always replace them with the correct commercially rated tyres. There are many good budget tyres on the market in the commercial range that will be every bit as good as the more expensive branded tyres.
It makes sense to have the gas and electrics checked at the same time, we charge £60 + vat for a gas and electric test