I am getting a resonance / vibration noise (no vibration feeling) when the car is in tick over. It is present in P, D, N and R and I can compensate and make it disappear if I lightly feather the throttle and lift the revs.

It sound like it is coming from somewhere behind the dash or behind the firewall of the engine. I think it may have first appeared following the replacement of the auto steering pump but cannot be certain. Any obvious things I should look at or try before booking it in to get looked at ?

Car running well in all other aspects 07 TDV8 125,000 miles.

Someone suggested EGR valves getting rattley when on way out ? 2013 L405 AB 4.4SDV8 Luxor/Ivory, 2007 Vogue TDV8 Epson Green/Sand, 2008 Vogue TDV8 Buckingham Blue/Sand, 2003 Vogue 4.4 LPG Epsom Green/Sage, 1998 Vogue SE 4.6 LPG Epsom Green/Cream