That bill can't exist. Dollars and pounds sterling are different currencies.
Please determine what country your bill came from and what its actual denomination is, then post a new and separate question with that information.
8 powtaytoows
One dollar.
One Pound GBP in 1972 had the purchasing power of about £8.80 GBP today.
The 1972-S Proof Eisenhower Dollar has a current retail value of $6.50
£10 in 1972 would be worth £97.50 in today's money, allowing for inflation.
$14.50 on ebay
About $3.25.
A 1972 Eisenhower dollar is just a big dollar, only proof & special collector's coins sold from the mint have more than face value.
the 1972 Kennedy half dollar is worth 50 cents in circulated condition, or about a dollar in uncirculated condition
Trade dollars were not made in 1972. Check and make sure you have the correct date.
about $10
The current metal value is 19 cents.