OK... Got the car back from the garage yesterday. The burning smell was caused by a pipe behind the engine. When I asked what the cost of the work was I was told 'this is a service'. This is by the garage who replaced the power steering pump. So I am guessing that something was not put back right. Not too bothered as it's fixed with no extra cost. However... It has to go back at the end of feb for a leak from the gear selector. Seeing as they have to dismantle half the engine bay to reach it I am not looking forward to that cost. They have said parts will be cheap, but expect a lot of labour time...