you may like to try The Real Macaw Parrot Holidays email- [email protected]
If you use Face Book you can find them on there.
Many speak very highly of them. Also your avian vet may know of someone too.
Do let us know how you get on.
I Board Parrots as well (Amber Valley Avian holidays) I am in Derbyshire but I do have customers from Scarborough and Barnsley, have a look at my website or Facebook page if you don't find anywhere closer.
The Real Macaw are in East Yorkshire near to Hull so depending on where you are may be a bit of a trek.
There is also The Parrot Lodge they are think down Cheltenham way.
Suppose it depends on where your going on holiday and if its from an airport etc what is closest to where your departing from.
Make sure that the place you use wherever it is licenced also that the birds are all health checked before going there that way it protects your bird and everybody elses too