Hi Gemma and welcome to planDisney.
How exciting that you'll be visiting
Walt Disney World this Summer. I will actually be there at the same time and can tell you that I'm already counting down the days, as I'm sure you are, too.
There's certainly nothing like exploring the
Theme Parks with your very own
Private VIP Tour Guide. I was fortunate enough to be able take part in a VIP Tour a number of years ago and honestly, the whole experience was just amazing! I must pre-warn you though that visiting the Theme Parks will never be the same again after having had the full VIP treatment!
You are quite right in saying that it is not possible to make reservations for a Private VIP Tour from here in the UK by calling 0800 028 0778, as the website suggests. I am however pleased to tell you that you are able make reservations by calling the Disney Private VIP Tours Team directly in the U.S. on 00 1 407-560-4033 (Lines are open from 2pm GMT to 10pm GMT). I have just tried calling myself and after a brief pause was connected straight through.
Top Tip - Reservations can be booked up to 60 days in advance. So, in order to secure the date of your choice, be ready to call as soon as the lines open at 60 days out.
I do hope that this has answered your question, Gemma and that you are able to make your reservation without any further difficulty.
Wishing you a magical holiday filled with memories which will last a lifetime!
Emma