Cheers , clearly a design feature then .
Got to be honest I was worried until I found out what it was, and then cos the EGR has never been off or been cleaned in 15 years, it wasn't a surprise if it were gunged up.
As this could be its last year, I'll leave it alone to next year depending on how regularly it comes on.
You're totally right re the EWL going out, as irrespective of who says what, on some cars it will only go out only when reset, whereas on others it can clear itself on start up .