Hasn't it been a no brainer for a while?
230+ advanced multirole FJ's to replace x amount of legacy aircraft.
I'd guess as a conservative estimate that 230 Typhoons could do the job of say 350 'legacy' front line strike/fighter aircraft.
When was the last time the RAF had 350 front line strike/fighter aircraft, let alone required them?
This isn't even taking in to account the lack of a future deep strike capability, which will obviously bump up the numbers further.
Are FJ ILS costs still 10 x unit purchase price?
No wonder the country hasn't got a pot to piss in.