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There are differences in price wise of course, but the things I would mention is the focus point and mindset difference rather than the cost/response etc. .
Let me share my comparison in brief. It is really the things I have experienced, it does not necessary represent the truth, it is personal opinion.
I think the majority of the NBs present in eastern Europe are heavily influenced by a german kind of attitude. Not only because they are german-austrian headquartered, but also because of the people are actually working within that region are mostly grown up in a german kind of educational system.
I am not saying it is good or bad, but the focus point are mostly on the administrative details, preciseness, heavy sampling and there is a kind of expectation to apply constantly control measures rather than to involve and admit common sense. I hope no one will feel humiliated, that's my personal impression, that's all.
On the other hand in the UK, NBs are mostly look into general conformity measures and looking to companies and products as a whole whilst making their judgment.
It is different probably because of the cultural determination.
Cheers!