IPAD will be available in the UK(and Australia, Canada, France, Germany, Italy, Japan, Spain and Switzerland) on Friday May 28.
You can pre-order all Wi-Fi IPAD IPAD and Wi-Fi + 3G models with Apple Now.
Buying in the UK IPAD

IPAD will be sold through the Apple Store, Apples retail stores and select authorized dealers of Apple. App iBooks for the IPAD iBookstore Apple will be available for free download from the App Store on May 28.
What IPAD prices in the UK?
IPAD begins not on the 429, 399 as provided prior to the announcement of prices. Like the U.S. price, the difference between the lower end models and high-end iPads is steep.
429(gross) for the 16GB Wi-Fi IPAD 499(gross) for the 32GB Wi-Fi IPAD 599(Inc. VAT) to 64 GB Wi IPAD-Fi 529(gross) to Wi-Fi 16GB 3G + IPAD 599(gross) to Wi-Fi 32GB 3G + IPAD 699(gross) Wi-Fi 64GB 3G + IPAD
Apple plans to release IPAD in Austria, Belgium, Hong Kong, Ireland, Luxembourg, Mexico, Netherlands, New Zealand and Singapore in July.
Do you pay the premium for IPAD UK?
IPAD is more expensive like-for-like in the UK than in the U.S., even if, to make a direct comparison is difficult because of the tax? C with various U.S. states charge different amounts of sales tax. Apples suggested retail prices are as follows:

How upset should be in the UK prices IPAD
To IPAD cheapest? C 16GB, Wi-Fi only version currently costs 9, sales tax of 10.75 percent(in California) the transition to 2.64. Transforming back gives a price of 377.69 at least 50 less.
What are the supporting IPAD 3G network?
IPAD shipped unlocked, so if you want to buy a more expensive model you buy a 3G Deal or pay-as-you-go agreement with the supplier. Three submitted IPAD cheapest data plan yet.
Orange, O2, Vodafone, and three have announced support for IPAD. IPAD uses a new type of SIM card, known as microSIM essentially the same size as the contacts on a standard SIM card.
If you pre-order IPAD, you can also choose to send micro-SIM card from one to three networks.
On May 10, Orange UK launches pre-registration on the SIM Orange.co.uk / IPAD. Pay-as-you-consume, daily, weekly and monthly plan will be available.

data IPAD Best Deals for Buyers UK
Orange SIM card fee price plan for data access 5p per MB of use each month, costing no more than 40 per month(without the optional packages). In addition, customers can also choose from four bundles of saving money for the planned use, or more frequent.
Vodafone offers 250MB of data per month to 10 and 5 GB per month on the 25th
O2 question 2 a day for 500 MB limit per day, 10 for 1 GB per month or 15 to 3GB per month.

Via: IPAD UK: release date, where to buy, network, and not only
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