I have lost my room correction information whilst setting this up, at the room correction stage it shows, "no measurements are present. Is there any way of getting this back or am I better of buying a microphone and doing myself? I do have different speakers and sub since it was set up by Meridian (Des) but its always sounded really good.
Hi Brian,
If you do not have the .msf configuration file dating back to when Des setup up you system then this information is lost and you will have to purchase a Sound Pressure Meter (SPL) meter and go through the procedure for yourself. To be honest have a SPL meter is a #1 essential piece of kit to setup a multi-channel system.
As you say you have different speakers and sub now so really your system need to be re-calibrated from scratch. Speaker level, Speaker Distances, Small / Large bass management and then after all that MRC should be run. I�d order a SPL meter (and a long analogue cable) ASAP and start reading the manuals and the WiKi whilst waiting for it to arrive

It does take a lot of effort in reading and re-reading the user-guides but it is all possible it just take a little time to get it right.
Regards,
Carl