For some time, there have been reports stating that the new iPad 3 will go on sale at a mark up on the original iPad prices by $70-$80 due to the higher spec.
Online reports from 9to5mac have rubbished this theory.
Reports stated that the US pricing would not o change. This is a strong indication that pricing would remain same in UK as well. Models are also reported to be the same at 16GB, 32GB and 64GB. there has been no news on the rumored 8GB version so far.
This means we can expect the 16GB Wi-fi model to be £399, the 32GB of the same to be £479 and finally the 64GB for £559. If you go for the addition of 3G, the price would go to £499 for the 16GB, £579 for the 32GB and £659 for the 64GB.