Hello Reub and welcome to SAYNOTO0870.COM. Thanks to everyone for the responses.
As CJT-80 said, Warwick Racecourse is one of a number owned by The Jockey Club Racecourses. Each has its own 0844 579 30?? number.
All except Aintree's 0844 number go through to the same recorded message which says that they are open every day between 8am and 8pm. Online bookings can be made at
www.jcrtickets.com.
In some cases the racecourse's main number is answered with an IVR (menu) which has an option to be put through to the call centre for ticket sales.
On The Jockey Club Racecourses' own website on the
page on Sandown Park it gives its ticket sales number as 01372 470047 which goes straight to the call centre for all but Aintree. I have therefore listed this as the alternative for those venues whose main number does not have an option for ticket sales.
I can only conclude that either the central ticket sales call centre is at Sandown Park or that it is elsewhere and this 01372 number is diverted. Either way, it's centralised and can therefore be used for all venues.
On each entry for ticket sales I've put a note to say that tickets can be purchased on the website.