Don’t know about this change. However, I would price up the flights (in PE and J) in pure cash terms, so that you know what they would cost you in ‘real life’.

Then work out what they would cost you using the 241 (again for both PE and J) and Avios. I would use 1p per Avios to convert it all back to cash. Then you can work out what you are saving with the 241 plus Avios over pure cash.

If the saving looks good and you really want to go in J rather than PE, then go for it. Or not, as the case may be.