Most users want both, at different times. I rarely use 'UK pages only', while I know at least one person who virtually always does, and berates Google for it not being the default. I'm happy to have the Word Wide Web as the default (makes perfect sense to me!), but it's nice to have a free choice.
I suspect once geolocation is bigger, it might be more effective in the UK, and we might lose that choice.
After all, the US users don't have a choice, and have to trust geolocation, reducing choice (in my view) as well as making national SEO more of a challenge.
SEO is increasingly 'location, location, location', and while we all have little control (and probably getting less), we still need to understand the 'location' behaviours of SEs.