From: In a van, down by the river.
A change in force composition?
The UK has IMO a few decent "specialty" tanks (Crocodile and AVRE specifically), and they do nice things with Sherman and Wolverine upgrades (like adding 17lb'ers to them), but aside from that (again IMO) the UK strength is NOT in its tanks.
With the OOB upgrades, the troops are now much more valiant, as I found to my chagrin in a recent JA vs. UK long campaign. And they (Britts) have some of the best (if not THE best) armored cars in the game. Speed and maneuverability, get beside, behind, or bypass alltogether heavy GE armor if you're having trouble with it. Use smoke from CS tanks (or carried mortars) to screen. Supress those tanks first with small, hard to spot units (2-man MG teams for example).
And don't be too conservative with AT guns either. Remember the smaller the gun, the less likely the chance to spot. The 2lb'er has very good accuracy (4 fire control and range finder) for as early in the campaign as you get them, and they'll pierce the sides of most GE armor (and any side of most IT armor) you encounter. An AT gun just over the crest of a small hill can fire one round, and move back to its transport unspotted the next if handled correctly.
Brits also have the largest capacity gliders in the game (albeit only a specialty use item) which means you can drop tanks in the enemy's rear.
If you want to trade a few more tips, just say so or give me a PM.
GL and good gaming!