As a customer of the UCAS Undergraduate scheme, you are bound by the Admissions Guide and the Business Rules contained in the The UCAS Application and Recruitment Policy (section 1), which is essential to ensure the integrity of the admissions service provided by UCAS for the benefit of its customers. Further details can be found here.
Specifically, the Business Rules include:
Applicant reply dates
Business Rule 9- Customers must not ask applicants to reply to offers before the normal reply date, regardless of when the offer was made, unless the course starts before 1 September. Requesting early replies in return for benefits (e.g., priority access to accommodation) is not permitted.
Changes and amendments
Business Rule 1 - Once an offer is made to an applicant, the terms of the offer should only be changed with the applicant’s permission if the change would impose additional or more stringent conditions on the applicant.
Please note, this applies where offers are made in error and need to be rescinded.
If an offer has been made in error you are, in principle, committed to the terms of the offer. It's essential that you contact the Customer Success Team immediately, regardless of when the error was noticed or whether or not the applicant has made their replies.