Even I've got a few wins with this, I don't use your exact build order but then again I'm a very low level player.
A few points I've noticed, the command vehicle seems to seriously buff infantry as well as tanks. I think ATGs seem to fire faster too. I usually upgrade a UC to wasp and keep it back a bit.
Three to four IS, one of which builds caches and acts as a reserve, the three IS cap their way to VPs then trench ( sandbags may well be better, hadn't thought of that).
I then pick a VP to defend based on how much pressure the opponent is applying, though generally favour the middle one if at all possible. Early game the UC trots around and helps out against infantry rushes or garrisoned 42s.
Bolster squad and save munitions for the air drop. Once I get that that crew with sappers, reinforce sappers, crew machinegun, reinforce sapper again. MG goes to the trench on the VP I've decided to defend with ATG slightly back whilst the IS goes forward to cap. Spare sappers build a mortar pit ideally covering 2 VPs with MG flank protection and the ATG partly covering.
I then build a couple of AECs, they're pretty fragile but with the command UC seem to provide quite a potent force against capping or harassing infantry. I try to keep them behind my lines and use as fire support, often around the middle VP ( gun on them seems to do a good impression of a Cromwells, though much less AI damage).
The mortar pit seems to be a honey trap, especially for OKW with blobbed shreks or ISGs. If they try armour I've beaten off Panthers, Elephants and all sorts with 1-2 ATGs plus the AECs.
Generally with 2 VPs I'll just harrass the third whilst hunkering down whilst my fuel ticks up for Churchill, Comet or Cromwells.
I think the UCs are just too fragile late game so will probably try nominating an AEC once it dies.
Biggest problem I've found is with artillery, LeFH etc wreck me and it feels odd to be out gunned with artillery as the Brits.
I haven't found any use for the expensive engineers, anyone know how many resources you get from a scavenged tank as mine have always died whilst trying it. And you can't build with them... 450 manpower is a big investment unless you're getting something concrete out of them.
Also the forward OP I've tried a couple of times but haven't really found a good use for it.
Artillery cover, do you use if offensively or defensively? Seems to be a bit indiscriminate when used up close and personal.
Edit: Just noticed you added youtube replays... Prolly answers some of my questions.
