Off Topic.
Taxes pay for Schools, Teachers, Law Enforcement, Hospitals (in some EU), Welfare (think disability) and much more. It also pays for the biggest expense of most countries - the Military (inclusive of R&D and actually funding an Army/Navy?air Force). And Nuclear Weapons.
USA is resource rich (Like Russia and China and other BRIC countries). It can afford lower taxes as it sells or produces a lot of it's own consumable product.
The UK is tiny in comparison, has no wealth of natural resource and relies on taxes to fund all of the above.
Simple.
Titan is still too expensive.