WIMBLEDON - I could find nothing on discounted prices but here is the link to the website regarding disabled access. I have messaged them requesting the relevant information when they get back to me I will let you know.

http://www.wimbledon.com/en_GB/atoz/accessbility.html

NEWCASTLE FOOTBALL CLUB

Newcastle United football club  disabled info

http://www.nufc.co.uk/page/Club/DisabledInformation

SUNDERLAND FOOTBALL CLUB

Information on all accessibility available at the club plus how to claim discounted tickets go to 

http://www.safc.com/tickets/accessibility

AINTREE RACECOURSE.

They offer concessions for people over 60 and students but not for carers.

However, information about accessibility for racecourse bars etc can be found here

https://www.thejockeyclub.co.uk/aintree/visitor-info/physical-accessibility/