Houses
The US taxes one for things one has not been taxed for in the UK. So it's not double taxation, but it is tax plus.
For houses that may be problematic. One doesn't pay capital gains on the profits from the sale of one's main house in the UK. They do tax that in the USA, so that might one day attract the attention of the IRS...
There's only two countries in the world that tax this way: the USA and the communist dictatorship of Eritrea...