As mentioned, pre-orders have already begun, while shipments should start in early January 2014. Phones 4u maintains exclusivity over the pink and arctic blue versions of the Galaxy S4 in the UK, which means chances are you won't find them elsewhere.
The pink S4 is offered for $54 (£33) a month on the cheapest 3G plan. If you pick it up on a 4G contract for $62 (£38) a month, you will receive a free Bluetooth speaker, worth $196 (£120). Phones 4u also gives its customers three months of free Wi-Fi via 12 000 hotspots across Britain.
source: Phones 4u via Pocket-Lint