Surely Not,
I think you're missing the point. My name is not on the side of the most visible helicopter in London. Virgin expect to have a massive advert flying around the capital 365 yet continue to reduce the amount contributed. Commercial realities or not it's taking advantage of a charitable organisation for their own ends and trying to squeeze the pennies down. I think it was down to 50k last year!!!!
And yes there is a belief amongst Joe Bloggs in London that Virgin pay for the air ambulance. Detrimental to fundraising.
What about pilot salaries, the most poorly paid multi-crew operation in the country yet the expertise and competence required equals that of many multi-crew setups and other better paid air ambulances.