Yes there has been much discussion about DPF removal since the recent MOT changes.
Regarding EGR blanking there are 3 consideration points:
1) Vehicle modification and insurance issues (no further comment)
2) If your engine ECU will complain if EGR is blanked unless you have the ECU recoded?
If the ECU measures EGR then the EML will come on and an EML is an MOT issue.
3) EGR affects NOx emission content ([ame]http://en.wikipedia.org/wiki/Exhaust_gas_recirculation[/ame]). The MOT test does not measure NOx. Requires specialist equipment.
There is a fourth item, namely one's green conscience.
On this latter point I have very mixed issues.
I bought a Euro 4 homologated diesel car (Croma) in 2005/6 that due to manufacturer early Euro 5 development came with DPF, enhanced EGR, etc etc. My car will pass all Euro 4 regs with no DPF and I'm fairly sure no, or MININIMAL EGR.
However the latest MOT regs will fail my Euro 4 homologated car just because it shipped with a DFP that was not required for it's Euro 4 rating but was fitted in early development ready for future required for Euro 5.
Don't forget your government ministers who dream up this crass ruling that Euro 4 cars with DPF have to comply with effectively Euro 5 DPF needed to meet Euro 5 regulations drive around in the latest cars funded by us tax payers.