10/10 Chaser, found it and plugged it back on no problem. looks like it's been off for ages, I've never had need to disconnect it, so it can only have been down to garage.
Although engine has been running okay without it, I felt that the performance wasn't what it should have been, which led me to clean the EGR valve. However, on the drive home from work this afternoon, having reconnected the MAP, thanks to Chasers help, it did seem to be back to what it was as I remember when I bought it. So although it runs without it, I think it runs better with it.
Thanks again Chaser.