Im actually on my second visit into eastern Europe courtesy of some very obliging hunting organisations, the main subject being to find out more about the impacts large apex predators have on Roe deer populations.
The general consensus being, absolutely devastating! Roe deer numbers have been reduced to a level where shooting is almost not needed at all. After many miles visiting different sites, signs of Roe deer are relatively scarce comparable to what im used to observing in scotland.
The behaviour is also greatly adapted, supposedly through constantly feeling pressurised. A lynx eating nothing but Roe will clear about one a week, but they are optimal foragers so if anything else crosses their path......
Also lynx are not a solution in regards to reduced numbers of our larger deer, eg red, fallow, they're simply too large for them and our countryside is far from ideal, there not being anywhere near enough tree cover.
Some of the places we're comparing ourselves to have over 50% forestry cover and no people.
The main takeaway which is outstandingly obvious is how urbanised the UK is. Its one big suburb from top to bottom.
We've created an environment which is not nature friendly so it'll be very difficult to re establish lynx certainly into southern England.

this is the view from an observation tower which was bloody high! Here you're looking over hundreds of square km of forest, I dont know of anywhere in the UK like this.
Id absolutely love to live in a country where you'd need to be aware of bears but the UK is far from that currently.
Two night ago our guides bear alarm was activated, the bear was raiding a farmers bee hives but we arrived to late to see him, I must say I did feel a little apprehensive looking through the thermal but alls we found was this track.

Doesn't look much but he was estimated at 300kg.
Conclusion, id love to live in a country where we might have an encounter with a moose or a 300kg bear but 90% of the UK is far from that. Too many people, too many cars, too many houses.