Your logistics skill are lacking…
Here is a sample:
UK1: Buy AC, TRN, 2 INF
Move 1 ARM from ECan to UK
Place the build
UK now has 4 INF, 1 ART, 2 ARM. They have a transport capacity of 6 divisions. They also have 3 air divisions that can be used.
You will notice that i said 6-8 dvisions, because you CAN get more divisions, but it changes the UK1 build to include another TRN.
As for WHERE those landings can occur…
the UK TRNs, depending on build location and UK1 movement, can occur in full force anywhere from Algeria to Archangel from the following SZs (depending on naval presence, etc.): 12, 7, 6, 5, 3, 4. They can do a 4 division landing as far away as SZ23 or SZ14, again depending on UK1 movment and other naval presence.