10/- was $2 in 1925. For many years it was $4 to the pound.
This website is invaluable for working with historic amounts of money in both the US and the UK. Their methods are well researched and use the best available data sets. Some comparisons are available back to the 13th century!
https://www.measuringworth.com
Putting in 10/- (ten shillings = 50 pence in current usage) and getting today's value gives a set of numbers from £25 to over £200 depending on which comparison method you use. If you look at the income comparison, a good measure of affordability, it's £143, close to the present day licence fee. You get rather more for your money from the BBC now than then.