Thinking about it, its quite surprising what costs are covered / included in the lease. We had a puncture and predictably the tyre gunk was no help, ended up with the RAC doing a temporary plug and Kwik Fit replacing it.
A few weeks later the car went in for a minor ECU update, during the drop off I enquired as to how much the gunk would cost to replace as despite it being useless the first time round it may be needed again – the receptionist went to check with the parts department and it turns out its considered maintenance and included in the lease, no doubt the dealer would have billed Motability but it was replaced at no cost to me.