Interesting thread this.
MME is by far my nearest and most convenient airport. I travel regularly with work but MME is consistently £300 more than the same route on KLM from NCL or LBA. Last minute flights are cost prohibitive - a couple of weeks ago I got quoted £1150 for a return economy ticket to Stockholm.
I doubt Eastyjet's new NCL-AMS route is really impacting MME as the majority of customers on the MME-AMS route appear to be flying on elsewhere via KLM. I think a bigger threat is SAS new route NCL-CPH, especially for those flyers going to Scandinavia.
KLM are still generally getting my business but I will only fly from MME if I can book 4 weeks or more in advance to secure a good price.