The british empire cannot invade europa if France, italy and greece falls, the central powers would just send their armies to counter their landings so there is no other way to end the war without a status quo ante bellum with the british
The problem is the contrary is also true; the CP or better Germany is not in a great shape, the blockade is still in effect and the internal situation in Germany, A-H and the Ottoman Empire is explosive, continuing the offensive is hardly doable, expecially in this scenario where there is not only the BE but also the USA to fight.
Germany can't surely invade the UK or take back her colonies and military support for the Ottoman will be costly and logistical challenging
The new territory in the east will need to be pacified...and rob them of any food to sustain the German population will not make it easy.
Not counting that in the scenario of a succesfull Spring offensive, the people usually forget that at the same time, the A-H army tried this on Italy resulting on them being beaten and basically ceasing to exist as a serious menace.
Sure many will say that still having German support and seeing the war not lost will still make the soldiers fight but the general supply situation of the Hapsburg army was horrible and their offensive in middle 1918 was basically an hail Mary to knock Italy out.
Basically, if Germany succeed in France, the Entente can win on Italy, probably not enough to knocking out A-H but enough to make her retreat from the occupied territory with enough loss to weaken her further.
While this don't make the military situation of the Entente look excessively rosy, also mean that's not totally beaten and negotiation to end the war will not very onesided.
Plus is not that Bulgaria is in a great shape either and another push it can make it crumble before any kind of help can arrive. Basically so late in the war and the premise of the OP, total victory or even a status quo peace (sorry what you describe is not a status quo peace as Cyprus and Kuwait were owned by the UK in all but name and everybody knows it) is out of the question.
Something will be gain and other will be lost...and as the A-H Empire wait a couple of years and the place will be ridden by various revolutionary and people very angry for the sacrifice made and all the blood and treasure spent.