Hmm
The UKVI webpage for Visa premium service centres can be found here:-
https://www.gov.uk/ukvi-premium-serv...ntres/overview
Cost is £400 on top of the standard application fee.
Don't forget you'll be needing to pay the NHS healthcare surcharge anyway so stumping up for the FLR(M) application this time around is going to be expensive which ever way you look at it without adding on the £400 same day service fee.
Better start saving