Currently bolster is a requirement early to keep infantry sections competitive which is sad. I enjoy the buffs but I can't agree with adding it after company commmand post.
Instead of moving bolster to require Company Command post, make it cost more MP, less fuel and require grenade upgrade.
The way I see it, the MP requirement/cost is too low with the amount of power it brings. Especially calculating the cost of adding additional models when the upgrade is complete. Increasing the MP cost gives it a slower power spike while still retaining the early game advantage but a little costlier.
The fuel cost requirement as high as 35 doesn't really make sense to me. Lowering it by 10 is better. I would even recommend adding grenades as a requirement before being able to get bolster as players will not usually get grenades before bolster. Its a nice pre-step before the power increase of bolster anyway.
Final verdict on bolster:
+ 50MP to bolster
- 10 fuel to bolster
+ requirement grenades first
In total:
+150MP requirement (100 grenade + 50)
- 10 fuel saved (but still 35 total for bolster, 10 from grenade).
I wouldn't say that Bolster is necessary to keep Sections competitive, four-man IS with 2x Bren already stand up to Volks and Grens with no problem. It's just so powerful and cost-efficient to get this upgrade.
Increasing the MP cost of bolster would definitely drag out the powerspike Bolster has, but I'd argue that 150MP is negligable. It's not even one minute of Manpower income. Also, saving fuel on this upgrade is probably not a good idea because fuel investments are central to teching. Spending on side tech delays main tech, so you're essentially trading a later powerspike for an earlier powerspike, which is a decision that must be made by the player.
I disagree with removing valentine from royal artillery as that removes super barrage which makes royal artillery *fun*.
Brits really lack a blob clearing tool outside of mortar pit and land matresses. Both of which are expensive and extremely vulnerable to call in's and other indirects. I would like to see a tool in to help with blob management. The vickers burst increase is a nice start but I feel it adds too much power to the vickers as it is. Its a powerful killing machine but not a blob management machine. It becomes even stronger in a trench which I would say is a requirement to use it effectively as a blob management tool.
Would a concentration barrage cost decrease/cooldown decrease work to make up for the Sexton barrage?
What do you mean by "blob clearing"? If you mean destroying blobs outright, the Land Matress and the AVRE are viable options. If you wish for indirect fire, I would say that providing the Brits with the USF mortar halftrack would be sufficient.