What used Renault Megane estate will I get for my budget?
How much does it cost to run a Renault Megane estate?
Servicing shouldn't be too much of a problem. The work is mostly straightforward and intervals are variable - on-board sensors decide when the oil needs changing and the brakes could use a look at - so you can help to keep your own costs down.
Likewise, you can avoid the steep main-dealer labour rates by using a good independent garage. However, Renaults aren't the most reliable of cars, so as yours gets older, it'll make sense to budget for surprise repairs.