Since I see other people are baffled by the mortar being gone from Lend-Lease, maybe either it being replaced by a Priest or Advanced Emplacements having a 25 pounder emplacement instead like in the All Units mod?
Brits seem to be lacking both non-doctrinal and doctrinal indirect fire units in general so more mobile or at least well protected/unique ones could be of use.
Too bad we don't have a proper 4.2 inch mortar model, unless the Soviet HM-38 one is used or something.
It would indeed fit in very well, in place of hold the line.

(credits To SneakEye)
Btw, speaking of advanced emplacements, the 17 pounder's new barrage ability shouldn't be locked behind vet imo. Instead, similar to the jagdtiger's similar ability, it should just get extra rounds with vet.
Also, I have tried the new raid section, but I just can't quite put a finger on them. Like where am I even supposed to use them in terms of range?
They have sprint to close in, but apart from the vickers they aren't really equipped for cqc, especially vs proper cqc squads. They also lack frag grenades. Commandos just perform far better at cqc and with brens they are good at longer ranges too.
They can sprint into cover, but they don't get an RA bonus there, unlike normal sections, plus they build slower.
I can slap a pair of brens on them and use them like regular sections without worrying about the debuffs out of cover, tho finding at least yellow cover for normal sections is usually not an issue.
They also can't heal themselves.
Sprint + plus molotov can be used vs garrisons, but the doctrine also provides flamers for engies, that also capture fast and generally fare better at close range.
It may be just me, but right now I just don't see why they would worth deploying, especially with all the other options in the doctrine.