Had a Windfall

My pension company informs me that they owe me backpay for underpaid pension for a few years. It relates to a European Justice ruling saying that Pension schemes have to provide equal pay for men and women. They were paying men the same as women, using the 60 and 65 difference in retirement. 
So on the 1st of December I will be paid quite a few thousand pounds more. Just in time for Christmas. 
Then the pension increase per month will be quite a bit more from now on.