I received this response from Sheffield this morning:
Thank you for contacting the UK Visas and Immigration enquiry service.
We have received a response from the Decision Making Centre following our
request for information on your visa application, which was the following
quote:
" Just to rectify the previous email sent, your passport need to be send
directly to Sheffield-UK.
They will also need to include a written statement of why they believe the
vignette was incorrect (E.g. DATES) and the address of where they would
like the corrected passport to go.
If in fact the vignette was printed incorrectly the shipping back to the
customer will be covered by UKVI, if it was actually correct the shipping
will need to be covered by the applicant.
We also recommend to write on the outer of the envelope "Priority
Correction" , in order to prioritize your case."
We hope that this has answered your query. For any further details, or
should you need to contact us again, please refer to our website at
https://ukvi-international.faq-help.com/Kind regards,
UK Visas and Immigrations international service
If anyone can just give me ideas of anything I need to put in the letter. I am on bank holiday until Tuesday so I cannot mail anything until then. Thanks for all the help guys.