Anyone know if they can do this after a confirmation order email is
sent?

Dear Customer

Greetings from Amazon.co.uk. We are writing to inform you that the
price of
a recently ordered DVD title was incorrect at the time of placing your
order, and we hope that we can clear up any misunderstanding.

Despite our best efforts, with the millions of items available on our
website, pricing errors can occasionally occur. In our Pricing and
Availability
Policy, we state that where an item's correct price is higher than our
stated price, we contact the customer before dispatching. Please know
that
we will be cancelling all affected orders. If you still wish to
purchase
this item, please place a new order online which will be charged at the

correct price.

Please accept our apologies for the inconvenience caused by this error,
and
rest assured that we will continue to make every effort to maintain the

accuracy of all prices on our site. We hope you will find this an
acceptable solution and look forward to serving you again in the
future.

Sincerely,

Customer Service Department 
Amazon.co.uk

Yes, they can - and it's fair enough, if you think about it. They made an 
"invitation to treat"; you made an offer, but their terms say they don't 
accept the offer until they despatch the goods. That's probably as much to 
ensure that in a cut-throat marketplace, if they are selling widgets for 1 
and their suppliers suddenly up the cost to 1.20; they don't then have the 
risk of their own supplier ordering 100,000 widgets for 1 which Amazon have 
to buy off them for 1.20.

What they CAN'T do (Empire Stores, are you listening?) is accept the order, 
dispatch the goods, wait until they're signed for, and then charge a revised 
price.


Tim