London Gatwick is the nearest mainstream international airport being just over an hour drive from HISC. Otherwise London Heathrow is 2 hours on a good day. Rail / Bus link gets you to Havant, but then you need a local taxi or bus to HISC.
There are limited European flights to Bournemouth International and Southampton International
Hayling Taxis serving Gatwick: Don’t phone the club – there is nobody there in a position to help. The website www.hayling.co.uk appears to list the main taxi firms on Hayling; look under the ‘Directory’ tab and then ‘cars and transport’