OK you Brains of Britain as you've identified all other issues I've had here's your starter for ten for the latest one

Last year after purchasing the car, I had the problem of oil leaking into the spark plug sockets. It was rightly identified and the cam cover gaskets were replaced and, I'm assuming, the crankcase breather system was also cleaned.
However towards the back end of last year I was aware of a burning smell coming from the engine compartment, sometimes accompanied by wisps of smoke as opposed to steam, when running at low speeds.
At the end of the year the fan belt broke and was replaced by a local garage and not the original guy I used. Soon afterwards I noticed the temp gauge moving upwards when engine idling or at very low speeds (traffic queues etc) but perfectly OK at normal running speed or on motorways.
The burning smell is still there and I have had a "Check oil" message which required a top up with a litre of the good stuff. While pouring, I spilt a few drops of oil on to a hot engine casing and it gave off a similar smell to that which I experience when running the engine at low speeds.
So, in your considered opinions are we talking of replacing the cam gasket again as it probably wasnt the "Recommended camcover gasket" or could it be yet another issue to help drain the bank balance ?
V6 CDX 2.5 litre, Automatic T reg btw