Does the value of G/W change if the fixed assets are revalued (upwards)? I mean, G/W was first calculated in 2014 and in 2016 the fixed assets were revalued, thus impacting the Revaluation reserve.
No, once goodwill has been calculated it will not increase in value as it is only calculated once, which is at the acquisition date. It can only suffer a decrease in value as a result of an impairment.