Well, started checking the measurements kindly supplied by Rippo: The measurement from rear (chassis) crossmember to tip of towing jaw was about 1" out :wow:. The bracing pieces that bolt to the bottom of the chassis crossmember has two holes though, so we tried fixing on the 'other' holes with the towbar sat loose on the chassis - hey presto the correct measurment! The only conclusion we could draw is that the towbar brackets had either been re made when the towbar was dropped, or were off a different MW (later ?). As everything else, cab floor etc checked out we have redrilled the towbar brackets and all is now well. Sorry for the protracted story, but it was driving me round the bend:nut:.
Following this success, the newly made crossmembers were 'fettled' and fitted!