And insurance to operate Airside? Very prohibitive cost wise!! Normal road insurance won't do.
Probably not as expensive as you think.... couple of hundred quid a year maybe, and if you run a fleet you'll just have a pooled policy that automatically covers anything with your name on it which will tend to work out even cheaper.
Public Liability insurance, which is basically what it is, is one of the cheapest things you can buy in terms of bang for your buck (i.e. you can buy many millions worth of coverage for relatively little cash because they know there's relatively little prospect of you making a claim anywhere near the upper-limit of the policy).
The only thing cheaper than Public Liability is Employers Liability Insurance.... but that's because the latter is compulsory for all businesses, so they've got more buyers to spread the cost over.