Re: Typical MOD bid scenario
mass production of heavy vehicles (I'm not talking about their systems or weapons) is something that was pretty well ironed out 50-100 years ago.
This isn't mass production. It's a specialist factory, building 600 units (of 6 different models) over a 4 year period. You'd hope it's better than hand built, but one of the problems of defence economics is that if you've not got a steady pipeline of orders, there's no point in investing in the machinery to make stuff cheaper. And then because it's so expensive, you don't get any more orders...
This is one of those areas where to be successful governments either need a long-term industrial strategy, or to bite the bullet and buy all their weapons abroad - and take the best/cheapest/quickest off-the-shelf option, as needed.
As an exmple, Type 26. We promised the voters in Scotland that we were buying 13 ships. To replace the 13 Type 23. Decided to keep the (general purpose)GP/ASW split at 5/8 - so ended up building 5 Type 31 and 8 Type 26. Ordered all 5 Type 31 on a fixed-price contract. All good. Babcock are making a small loss, but they've managed to build a working shipyard with the money, and got export orders, with hopes of more sales to Denmark and/or Sweden. Plus we need more ships, and are short of yard capacity - they're sorted.
What's not-so-good is how we only ordered the first 3 of Type 26. We ordered the final 5 a few years back - so there was absolutely no point in not giving that order. We needed the ships, we were going to buy teh ships, we bought the ships. But by not ordering them all together we didn't give BAE the reason to build their "frigate factory" - all indooor shipbuilding and ship-fitting. An investment they would probably otherwise have made. HMS Glasgow had to be delayed for months while they rectified bad welds that had been damaged by being done outdoors. It's probably added a few tens of millions of quid to the cost of each of the first 3 ships, delayed their building (so we had to expensively life-extend some Type 23s) and now means that we're going to have to give up a much-needed ship to Norway in order to fulfill a lovely export order to them in a timely manner. Even without spending a penny extra, we could have had HMS Glasgow at least on trials by now, and the second ship pretty much ready to join the fleet simultaneously with the first-in-class trials finishing. And both would have been a few quid cheaper. And that would have saved us at least one £50-£100m Life-Ex of a Type 23. Plus Norway and us would both have top-drawer ASW ships in the water years earlier, to defend our underwater infrastructure from Russian tomfoolery.
Also we've got to replace our amphibious warships (Bay class, Argus etc.), stores replenishment ships (only finally ordered last year with the old ships falling apart), Batch 1 River OPVs all within the next 5 years (ideally should have all been ordered a few years ago), and then in the next ten years we've got to replace Type 45 with something new, build/buy some mine/undersea warfare drone-boat motherships plus finishing the 5 Type 31, 8 Type 26, 5 Norwegian Type 26 and watever Denmark and Sweden buy. Oh, and the handful of autonomous ASW boats, that have to be big enough to sail the North Atlantic and whatever arsenal ship we build to partner the new air defence destroyer. To be fair the last government started building up yard capacity a little ten years ago, but it takes ages - and now we're at a crunch where I suspect we'd like to expand the Navy a bit, but don't have the yard capacity to do so.
Having not ordered a large AFV for 3 decades, we had to build capacity. Hence Challenger 3 is a re-furb of Chally 2 with a new turret (partnering with Germany), Boxer is another partnership with Germany for heavy wheeled infantry vehicles and some specialist stuff (mortars, self-propelled artillery, air defence etc) and Ajax was a US partnership to avoid BAE, who're involved in the other two.