If you have an entry and you can no longer participate in the event you are permitted to transfer your race entry to another person on the proviso that this is completed officially via the race administrators. Contact email@example.com.
If you cannot run and you do not have someone to transfer to, you can advertise your place by 'posting' on the Staines 10K Facebook page. There are plenty of disappointed runners who are unable to enter as the race sells out extremely quickly. We suggest that you private message the transferee and then contact Sport Systems as above. Similarly, if you are looking for an entry, please post this and also monitor the facebook page.
There have been a number of successful transfers using this method in the past.