Will a brief lack of lead substitute damage the engine of my Series III Land Rover?

I normally add some lead substitute to the tank of our 1980's Series III Land Rover. The other day I didn't (because the garage didn't have any on its shelves and I then forgot about it). So with a full...

I have 90 litres of 10-year-old unleaded. Can I use it in my car?

I have approximately 80-90 litres of unleaded petrol which is 10 to 12 years old. It is clean and stored in approved marine petrol tanks. Can I use it in my car or is there some way to recycle it?

Can I run my classic Mercedes-Benz W123 E-Class on unleaded fuel with an additive?

I am buying a 1982 Mercedes-Benz W123 200E. It is in superb condition, having only covered 99,000 miles. Would it be better to run it with unleaded fuel and add lead-type additive, or is normal unleaded...