Thanks for all the input, I've decided to keep the BL18's. I think that maybe I've not set up the Beovision 11 properly as I've been waiting for the new software update, once it's out I'll spend some time setting everything up and then decide if I need to get a BL11.💡
Cheers TC
Instead of getting a BL11, why not aim for a BL 19 instead. It will give you more and deeper bass than the 11 will.