Try clicking onto "Emission Controls.co.uk" they offer EGR valves. I have not checked prices.
I`ve emailed them and their answer is: "Sorry we cannot help you with this part Honda dealer only".
Anyway I`ve checked the EGR valve, it looks clean and I can move the stem.
My car has 45500 miles, 52 reg, mainly driven in London.
I`ve appointment at Honda Chiswick on Friday. I`ll post the result. To check my car will be about £34.00.
Mod.
I think I`ve fixed my problem accidentally.
I took out the EGR valve, had a look in my hand, it looked clean. I pulled out the stem with the screwdriver, but the stem`s shoulder is so small the stem jumped back to its original place. I`ve repeated this about 3-4 times and fitted back.
The next day I haven`t noticed any changes but a day after I did!
My engine runs OK!
The thing what I did was the stem jumped back and the dust from the top of the stem (up inside) fallen off, so it "cleaned" itself.
I`ve cancelled my appointment with Honda.
I hope my story helps you guys.