I got £40 for no IFE in F for LHR-CAI a couple of years ago.

You had to use the voucher in the BA shop - where they charge you £25 to issue a ticket. I.e. £15 for no IFE for 5 hours!

(However, I did get the 100k miles for the Walkout last year as I was travelling on the day of the walkout)