With a government backed welfare(for the welfare of man and nature) low volatility savings currency. you could AHS (Advanced health service for non routine high difficulty health problems and training of public health service professional)paid for in the main national currency some of which can be turned into the saving currency more than a standard worker PHS(the public health service paid for by new savings money/private to public investment/community investment).
A person of long term ill health can have an experience that can be far more tailored to their needs and better treatment relative to the best thought out intent from private/community/ and public interests.
you would also get EHS which would include some private health extensions some public. Jobseekers could be paid in savings currency be employers looking to increase training of potential employees, donations, new money, and some money from the main currency off the budget and basic extra earnings, disability extensions to jobseekers could be a lot more interpersonal and relative.
Middle earners and up would pay a NI topup and the basic NI is lower than now for PHS and AHS but the overall tax would be less for both groups if they have to pay top up they can instead opt for a private option where by PHS and AHS is covered but you get some extra EHS.
15% of corporation tax automatically goes into welfare savings operations under stricter tax rules than the rest of the tax which the company can chose what to donate if they don't want to choose the issue is decided by the government.
This would save about 120 billion pounds from the budget and earn an extra 160 billion for the UK economy per year.
The roll out group would allow for more cost effective roll outs and at the same time would lean more on the wider industrial market to implement a lot of it more cost effectively in line with consumer costs this could work more with welfare saving currency for some rollout projects
35 billion saving and 30 billion extra in growth per year.
With the standardisation of a national licensed gambling currency the government and public transport companies could subsidise along with regulation a certain portion of train,bus&coach voucher with some amazing discounts on some higher end trips. This could actually lead to savings on current subsidies.
Savings 1 billion, benefit 14 billion per year.
So that's about 156 billion saved each year and an extra 204 billion added.

ain't nout wrong with my balancing of the books here.

So you get a discount on your electricity bill if you shift from gas heating to all electric. Which you can pay back at a more affordable time at the latest 2 years from now but you don't have to pay any interest. This is because the government pays this discount and when you pay back it goes back to the government.
cost 2 billion savings on gas use 8 billion.

Do you see what i'm doing I'm optimising through incentive not just tax and spend considering the need for an optimal robust human driven market and effort of care.