I've seen some previous concerns about the effects of shifting many billions of tons of weight on the earth's surface as the result of glacial loading and unloading. Interesting!

It is a good reminder that our earth is less like rigid baseball and more like a very flexible and fragile water balloon that can be distorted relatively easily by the slightest of perturbations.

I am beginning to come to the conclusion that the earth is such a hopelessly complex and chaotic dynamic system that I seriously doubt we will ever succeed in developing a deterministic model that can accurately predict future conditions. I'm not saying we shouldn't try to gain a better understanding of what is going on, but on a certain level some things are literally unknowable.

The phenomena is called Isostatic readjustment. It is happening in the North Sea and the Baltic. As Ice load is removed, the continental crust re-adjusts slowly over time and rises quite gently.
You get things like raised beaches. Northern Europe is not very tectonically active so seismic activity due to readjustment is not an issue. Except perhaps on the Great Glen Fault which stirs occasionally.

However (I seem to recall) there is evidence of Submarine slumping off Norway which , in the past may have created a Tsu-Nami that hit the UK very hard.

On the other side of the coin, The south east of the UK and the low countries are sinking slowly.Polar melt will be an issue for these areas. (Thats why the Dutch love boats).