🤦♀️ Yes currency depends on "faith", but money is real, and currency does have value. It isn't "magic". Yes we could "print" money, but immediately all the other pounds are worth proportionately less. Life savings are eroded to nothing though such folly.
Our public services aren't paid for though "printing", and imaginary money. They are paid for through tax revenue. The true magic is in £1 being turned over multiple times, though one transaction after another, a cleaner is paid, they buy groceries, the grocer gets in an electrician, the electrician gets a haircut, the salon has their premises painted, the painter goes out to dinner, the restauranteur buys a book. Each time the £1 turns over, at least 20% of £1 goes to HMRC in VAT revenue. £1 in the pocket becomes £7 of wealth generated amongst the community - and £1.20 of VAT goes to HMRC. Plus income tax.
That is what pays for your NHS.
Lockdowns stop the multiple turnover of £1. £1 remains in the pocket, as £1 and only 20p goes to HMRC. In this way, lockdown ruins the nation and, no, the nation cannot afford lockdown.