Peter have you had a look at the Shoreham slot allocations? Are they all taken up already?
I just had a look at the
website that one is supposed to check; for my home airfield, Thruxton, I was somewhat surprised to see only two per hour on most days. What I thought was weird though is that it only lists slots being available from 0700-1900 each day, ie 0800-2000 local, earlier and later than that is listed as having zero slots throughout the period. Does that mean that I literally can't file IFR before 8 o'clock in the morning or does the co-ordination only come into force at that time? I'm a bit confused and the 100+ page airspace guide hasn't really helped.