Why is it that Kindle fire supports flash in the USA and not UK?

In silk the US version gives you the opportunity to enable or disable flash, it doesn't exist in the UK one. Speaking to amazon.com they can't understand why it's not there but speaking to amazon.co.uk they say kindle doesn't support flash. As a result my daughter can't view any flash websites, specifically the homework website we were intending her to be able to use on her new kindle. Total waste of money.