1, have battery checked
2, Have intrim service (at the very least) done on the vehicle. (oil/air/fuel filters. Oil. changed. Also have a engine flush. Dont go for the cheaper oil, instead go for a oil that is mid to higher price range ( range making sure it is the correct grade. If your vehicle has done over 100,000 miles use a higher grade of oil (ask your local spares shop for advice).
3, Replace glow/heater plugs (depending on age & mileage since last replaced)
4, Have brakes all round checked & replaced as required. (Kwik Fit will do FREE BRAKE INSPECTION FOR YOU)
5, Make sure your tyres have at least 3-4mm of even tread on them. 1.6mm is the legal limit but on wet/wintery roads your better off having 3-4mm minimum, dont forget to check your spare wheel either. Check the tyre pressures at least once a week.
Regarding which oil grade to use in your vehicle check your vehicle handbook or ask your local spares shop. I only use LUCAS oils now as it is probably the best on the market. Go onto ebay & type in item number 270312386383. If this is not the correct grade simply email the seller telling him which grade you require. If you have a local spares shop that sells this particular make of oil get it from there as it will/should be cheaper as you wont have to pay the P&P. I pay £15.99 from my local spares shop for this oil. LUCAS do a full range of different oils & also supply additives & stabilizers.
Richie.