U.K. pricing starts at 79p/month for 50GB, rises to £2.49/mo for 200GB, and tops out at 1TB for £6.99/mo. Euro pricing is €0.99/€2.99/€9.99 respectively. Unusually for Apple, these prices are pretty much on par with U.S. pricing after allowing for VAT (European sales tax).
You can check out pricing for other countries in the Apple support document, updated today.
Note that you cannot immediately upgrade to these new storage tiers: iPhones currently show the old pricing when attempting an upgrade. It’s likely that the new pricing will start alongside the public rollout of iOS 9 later today.
It was revealed yesterday that Apple is creating a new software platform to unify all its cloud-based services.