Cheers all, will have to check both cars out side by side over weekend (nothing special on that I can think of!) regarding the heater & connecting hoses. Although my car, a 09 2.0Ltr Turbo VXR Racing model, does heat up & blow warm air it's about a third as powerful fan at same setting as the 1.8Ltr SRi & the temperature appears much lower at full setting.
I only ask as my Vitara has an electrical problem with the temperature sensor bringing the rad fan on when not required meaning the car at moment doesnt run at anything near normal temperature, new sensor on order though.