Depollution system faulty - P0238 & P0401 Fault Codes

I carried out a service on the car a few weeks ago (oil/fuel/air/pollen filters and oil change), shortly after that the car started playing up. I'd get the depollution system faulty warning and the car had little power from a standing start especially if you put your foot down. The last time it did this I replaced the turbo solenoid and that cured it, while that was about ten months ago I thought for £40ish I'd do that again as it's a quick hit. That didn't help, I've since checked through anything I touched on the service and seems to be ok, EGR looks clean but I blanked that off to see if that helped. It has seemed to help until today, when heading over a roundabout, with out putting much power down the EML came on, depollution system faulty warning and I scanned the car and got the P0238 & P0401 Fault Codes up.

Any suggestions on what could be a common cause for both those or is that likely to be because the EGR is blanked?

I've attached the screen shots from diagbox.