The RTTC National 50 mile Championship has been rescheduled for Saturday 29th September 2018 with a 7.30am start. 
The organiser, course and HQ are the same.
If you are unable to make the new date, you can withdraw your entry (before the new closing date of 11th September) by logging into your profile and going to

Events > Completed entries > Receipt > Withdraw.

This will automate a refund to your account.

The event is also open to accept new entries.