Switching courses at Warwick

If I only applied to study psychology but am now interested in the EPP (economics, psychology and philosophy) degree, will they let me switch once I get there?

Some more info - the EPP degree was on clearing last year, my grades are fine for it (contextual) and one GCSE grade lower, but I didn’t do my GCSEs because of covid and my school wrote in my application that they don’t offer retakes.