I just feel if it's taken two working people 20 years to save 100k once the husband gets his 70k pay off, at this rate of saving, say another 20 yrs, by which time they will be in their 60s, where will they live?
They will have to pay full market rent, not subsidised army rent over these 20yrs, so even with 200k, bearing in mind inflation, life will be v challenging financially. You'd be in your 60s on bedsit money in assets with 3 children, 1 still reliant on them.
The numbers just don't work. Each have gained in assets the equivalent of £2500 in per year from the age of 20 to 40, so essentially 90% of all their money historically went to someone else... Even with the army's subsidy.
I fear you'd be relying on the state quickly if 1 of you got ill, you lost any future jobs, had care responsibilities etc... Let alone a newborn.
Again, I'd not have another child. Instead I'd use the years ahead with fewer childcare responsibilities to earn money, savings, put into a home you own, and finally gain the start of some security. The army money might sound like a lot but it'll pay for a couple of cars, pay for your children to do a 3yr degree at uni sum, bit it's not much towards any kind of family property. Sorry.