The issue with one Typhoon versus 50 old MiGs would be that HM Govt only purchased 15 AMRAAM missiles as a cost saving measure. Obviously the supply chain would only let our steely eyed killers have 14 of them because they would have to keep one back in case anybody needed it.
Then having taken out 14 MiGs, there would be the painful pregnant pause as we looked to Uncle Sam to bale us out......... again!