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As the 100th anniversary of the battle approaches, what would the short and long term consequences have been if the Grand Fleet had sunk all the German battle cruisers and at least half the German battleships?
Short term means its influence on the course of World War One.
Long term means from the end of World War One to 1939.
As threads like this often break down into discussions of how the event proposed in the OP could not happen, rather than the consequences of said event, this is what can and cannot be changed:
There are no improvements to the quality or quantity of the British ships, the accuracy of their gunnery, the quality of the ammunition or their crews training for night fighting;
However, improvements in the quality of cordite and turret operating procedures are allowed because IIRC one of the British armoured cruisers at the Battle of the Falkland Islands nearly did blow up, but no corrective action was taken;
Better communications between the Admiralty and Jellicoe is allowed;
Better communications within the Grand Fleet are allowed too;
Individual commanders of ships, flotillas and squadrons may show more initiative;
The seaplane carrier Campania can sail with the Grand Fleet and the Harwich Force can be used;
British losses in the battle must be no greater than IOTL unless the German battleships are wiped out rather than suffering 50% losses.