I've given up trying to work out how many Typhoons we're supposed to be getting - working out the various tranche permutations is worse trying to do the individual problem solving exercise at OASC!
However, I was wondering - are the earlier versions being progressively upgraded as each new tranche comes into service i.e. T1 upgraded to T2, T2 to T3 etc so that we will eventually have a common fleet? Or will we just muddle along like we have with the GR4s and their ahem 'Diamond' fleet and all the headaches that causes?