Getting back to the OP's original question, this is the quote I've just received from Petair :
The following are included in both packages:
Airline ticket from London with Thai Air to Bangkok, Thailand (subject to availability)
Airline surcharges (Handling / Security / War Insurance / Fuel / Airway Bill / Transit Fees)
Custom made PetAir UK, IATA approved, wooden travel container with bedding and water facility (see below)
Export customs entry
Meet at airport for assisted check in
Out of hours check in for Sunday flight
Our Gold service additionally includes:
DEFRA export health certificate application
Import Permit
Collection from home (DH postcode) and three nights boarding
DEFRA export health certificate completion by a vet
Transport to the airport
Check in
Agents services on arrival for cutoms clearance and airport handover
We can provide the above services for a total cost of Silver £1354.84 Gold £2607.84.
If the OP has found a solution to his question I would appreciate any info as we're looking to take a dog over.