Nope mate it isn't. I took the plate out when I began getting this issue, and as I mentioned above at the same time I started getting the EGR code. Maybe was just a co-incidence.
Removed the EGR blank, code is gone, but it didn't fix my problem. Cars back to normal only after fiddling with the dawes/needle setup.
I got another blank from Mudksi with a hole in it, so I'll drop that in this weekend, and see what happens.