Re: It will cost us money...
The compensation paid in 1833 worked out at about £30 per person, so I think they meant £50 not 50s in 1772.
Comparing 'value' over time is very difficult. Depends what you count and how. RPI? Wages? There's a nice online calculator which came up with this
In 2019, the relative value of £1 0s 0d from 1772 ranges from £127.70 to £15,880.00.
A simple Purchasing Power Calculator would say the relative value is £128.80. This answer is obtained by multiplying £1.00 by the percentage increase in the RPI from 1772 to 2019.
This may not be the best answer. (Their words!)
I was doing some work on social history in the 1850s. Weekly wage for a skilled craftsman (Smith, Carpenter etc) was £1/1/0 (I guinea, 3/6d/day) What does someone like that get now? £25K? So about 500x . Beer then was usually 1d or 2d a quart. It's now about £3, so maybe 720x (but it's now heavily taxed of course! About 10/- per pint + VAT, so take that off and that's down to £2, so about 500x again over 170 years). It looks like wages increased by maybe 50% from 1770s to 1850s, So a 'fair' estimate of the 'value' of £700K now is probably about £500 million (about 1/6th of an aircraft carrier), not £269billion!