I would consider an IC in Romania with a airfield. this would allow you to crank out troops toward Caucuses and not worry about building more than transports in the black sea. with the airfield you can scrambler fighters stationed there in defense and they can be used to attack with ground against Russia.
Scotland Minor IC
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If UK wants to buy naval units that are out of range of German fighters, their only non-Canadian option is SZ119 (which is still within bomber range of Norway and Normandy). But, SZ119 borders Scotland (which is completely empty), not United Kingdom. That means that if you don’t want to build up your navy on the other side of the Atlantic, you’re also going to have to drop another dozen IPCs on a Minor IC for Scotland.
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Sounds like a waste. Best to just build when the german fighters are not in range (aka, fighting russia) or even just save for a turn or two.