1. I believe the best move is for the Allies to combine in z8 first round. This gives the UK more flexibility in purchasing because the US reinforces the UK, so in reality the threat to the UK isn’t significant, it just needs to be answered.
The primary goal of the UK1 build in this scenario IMO is to threaten WE so that the Germans can send as little east as possible. The reasoning for this is that sometimes when Baltic Navies are built, the USSR can move their stack to Ukraine on R3, spelling trouble for Germany. If there are enough planes on WE where you would be concerned about an attack on the combined Allied navy, have the UK build 1-2 transports. The secondary goal is to threaten the Baltic Navy by building planes. These two builds are okay - 2 trans, 3 inf, 1 tank or 3 fig. But what I think is probably the ideal build for that German open is 1 trans, 2 fig. It significantly threatens WE and if the UK attacks the Baltic on UK2 with 4 fighters and a bomber, all the ships are destroyed on average costing the UK 2 fighters. So in order for the Germans to hold the Baltic, they have to build even more ships on their next turn.
I’m assuming a R1 build of 3 inf, 3 tanks and either attacking Wrus only or Wrus/Ukr. Just make sure on R2 to build enough tanks to keep Germany out of Karelia.
2. I’m opposed to adding to the Baltic navy in the first place but if you consider holding the Baltic for a while to be a priority, then you’ll have to add to it G2 or G3 depending on your opponent’s reaction.
If you’d like, you can try that against me on the forums. I’ll give you a bid of 7.