It is worth noting however, that even before the recent PistonHeads lead campaign, Yorkshire Air Ambulance does not seem to have a problem with getting the donations it needs. Last year for example they had £1,199,577 gross income with £967,246 of expenditure (which included buying a new helicopter) and they have £418,000 in reserves.

There are other areas that don't yet have an air ambulance.
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Remind me to change my signature to something more interesting someday