Raising Kitchen Worktop To Accommodate Appliance Height

[OldChestNuts]

The fitted kitchen worktop measure 850mm. The appliance also measure 850mm.
I am trying to remove the worktop and raise the entire too and cabinets. However, the worktop mitre joint is glued and I am not sure how to break it apart.
Are there any suggestions? I don't want to damage the worktop.

[Buenchico]

Disclaimer: I'm totally rubbish at DIY! I struggle to tell a hammer from a chisel or a nail from a screw, so I might possibly not be the best person to answer your question!

However . . .
A quick look at YouTube finds plenty of videos suggesting that what you need is a heat gun to melt the glue. (See example below). Then a bit of googling shows that most hire shops have them available. (NB: Make sure that you get a 240V one, not a 110V model intended for trade use). e.g. https://www.jewson.co.uk/p/hot-air-paint-stripper-JTH05665

Having written that though, I'm not sure as to how easy or not it might to get the heat to where you need it but, until someone comes up with a better solution, that's the best I can offer you for the moment.

[The Builder]

I agree with Bueno. It would be very difficult to get a heat gun into the right place.
Worktop mitres are not only glued, but clamped together mechanically.
Whenever I've had to do something like this, I've left the worktop intact and lifted it off in one piece. (You may need someone's help to keep the worktop from bending.
If you're careful, the mitre joint is well strong enough to take it.

[OldChestNuts]

@The Builder, yes that is the plan. Will try and remove the top in one piece l, with the help of a second per of hands.
Thanks for the input.