Premium service center not available in time?

[nihMoham]

My wife's leave to remain expires 8th of June. The only premium service center where we can apply for the 1-day process is in Glasgow, and the earliest available appointment is 18th June. Is she legally covered if she submits her online application today, but makes an appointment for that date, as under section 14 of the FLR(M) guidance here - https://assets.publishing.service.gov.u ... l_2017.pdf ? OR is the postal route the only option for us now?

[Casa]

The date of application is the date that you attend the PSC appointment. If your wife is unable to book an appointment before her current visa expires, she will have to apply by post.