It's dead easy mate, I've just done mine
Just follow the egr pipe from where you have taken the photo to the other end where you will find a join with two M6 cap heads.
This is where it feeds back into the inlet track

, you just undo those two cap heads & slip in your blanking plate & tighten them back up with a smear of hermite red for good measure

.
There is a guy on ebay selling the blanks for a few quid, you want the 1mm thick one & I'd go for the one that's sloted NOT the one with holes in as it's quite easy to cross thread the cap heads when putting them back in

( trust me I know ) so if you get the slotted one you just loosen the cap heads & slip it in

.
I made my own, but only because I couldn't wait for the postage

.
I can assure you it'll run fine with the egr blanked, just remember to plug the electro valve vac line to it ( it's the blue one on the bulkhead )
If you have a dosser fitted you may want to remove that as well as this works in conjunction with the egr valve.
I did away with mine by simply cutting off the solinoid with a hacksaw then cutting the butterfly valve & spindle in half ( it's only plastic ) & removing it, make sure you have removed the bit of broken spindle from the blind hole side ( the opposite to where the solinoid was ).
This will leave you with a 9mm hole to fill up, this can be done with some araldite ( just make sure you clean it with some thinners / acetone first ) leave it 1 hour to set & reassemble.
Oh & don't forget to plug up the Dosser electro valve as well ( a couple of 5mm bolts will do, I'd put a small cable tie on as well just for good measure.
You car will now breath better & be better on fuel Happy Days

2002 110 HDi estate, Rapier in monaco blue! ( found quite a bit more power

) SOLD I've sorted the airbag light
1998 3.0 V6 SE coupe in Diablo Red ( my baby ) sold
2006 206 1.4 16v sport in Aegean blue ( wife's shopping trolley

)
2006 BMW e61 535d m-sport

run's for cover
