Things that The Rich could pay for if they weren't so shit:

Council Tax (£10 billion)
TV licences etc (£1/2 billion)
Road and Rail infrastructure (30-40 £billion)
Health care and education (at least for people aged 3-65)
less than (£200 billion)

NI contributions would more than take care of the elderly and disabled.

There are enough empty properties in London to house the homeless of Great Britain!