Yesterday we buckled and purchased priority and the return courier airbill (since we've sold our house so I wanted the docs returned to our forwarding address with a relative). Today we got an email from Sheffield claiming that priority must be purchased before submitting the documents(see below).
I have emailed VFS global to ask their advice: I'd recommend others wait to hear what happens before potentially wasting $500-$700 like we might have done. The incompetence in this whole process is staggering.
email from donotreply@hgs-ukvi.co.uk:
Dear XXXXXXX,
Thank you for contacting UK Visas and Immigration international enquiry
service.
With regards to your query , the applicant must purchase the user
services(Priority service, SMS text service, Couriered back service) before
submission of document at visa application centre.
We strongly recommend not to book prepaid travel and accommodation before
receiving the visa.
For any further details, or should you need to contact us again please
refer to our website at
https://ukvi-international.faq-help.com/, select
appropriate country, click next and then select “E-Mail form” and
complete as instructed. We will aim to come back to you within 1 day.
Kind regards,
XXXXX
UK Visas and Immigration International Enquiry Service
We would like to invite you to participate in a brief survey about the
service you received from us to identify strengths and opportunities for
improvements.
http://www.smartsurvey.co.uk/S/130335JPJLGThank you in advance for your time.