I usually never can~~'t~~ afford that much stuff in SA or an airbase because of the sealion threat (for the first two rounds at least). Gotta buy either 9 Inf or 6 Inf/1 Ftr in London turn 1. I mentioned fast units in SA after the Sealion threat is waned to get units to Cairo ASAP.
Typical German turn leaves all UK ships save 1 DD, 1 TT in SZ 109 and 1 CRU off Spain left. Most German players I play buy at least a TT and a SS as part of their first turn buy, which leaves a Sealion visable with a 9-10 TT buy turn 2.