The UK is a net payer of the EU budget. It can replace all EU subsidies like for like and still save some money as a result of Brexit.
Same as investment in the NHS, which although not funded by the EU has badly needed structured investment for decades. Never happens. Successive governments just blame their predecessors or bad management and on this the cycle.
If they leave they have £5 more money in their pocket! They should leave right, rather than wasting that £5??
Getting those back will cost more than staying in, and already has.
The NHS is currently underfunded, to the extent that Darzi walk in centres are closing and some important targets are going to be loosened because trusts have no hope of reaching those targets.