It would completely depend on the interest rate that was given in 1969 ...
About 12,231.12 pounds.
If you are talking about cash (GB Pound bills) worth 200 pounds from 1800, they would still be worth the same 200 pounds today and would remain to be worth the same 200 pounds a hundred years from now. If you are talking about investments like bank deposits or shares or bonds etc., then the value would have varied depending on the rate of returns of the instrument in which the money was deposited.
Five Hundred Pounds GBP in 1816 had the purchasing power of about £26,400 GBP today.
one hundred and eighty pounds
£20,000
it would be worth 80 pounds. I think it would be worth 250 pounds today.
5 pounds is worth 5 pounds.
As of today (01APR2011), 2.50 Pounds is worth about $4.03 in USD.
350 pounds
A hundred dollars today versus a hundred dollars in 1911
20 million pounds in 1833 would be worth aproximately 1.25billion pounds today (2014)
140,000 pounds