on the letter it states passport can only be returned to local immigration team to arrange removal from uk

ESC
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it is possible to vary the grounds of an application already made,
even by introducing something completely new. A student application can be varied
so as to include marriage grounds. If an application is varied before a decision is
made, the applicant will be required to complete the necessary prescribed form to
vary his application. If an application is varied post decision, it would be open to the
applicant to submit further grounds to be considered at appeal. As a result, there
may be little difference in practice between a fresh application and a request to vary
an existing application.