Should I sell my car with the service light on?

I am wanting to sell my car in the next month but the service light has just come on. Is it worth getting it serviced before selling it?

Considering the concerns over identity theft, is it wise to pass on all the service history when I trade in a car?

I am considering trading in my car. In the past when I sold a car privately I passed on the service history together with bills, records of payments etc. In view of current concerns over identity theft...

If I take my SORN car for an MoT, do I need to tax it if it passes?

My car is on SORN. If I take it for an MoT and it passes, do I need to tax it immediately or can I leave it on SORN and tax it later in the year?

How much does a Cat S marker affect the price of a car?

I have a Cat S car thar drives very well all and works as it should. What do you value a car of this type?