There are about 53 million in England and Wales (the Scotish and NI figures are compiled seperately)
The murder rate per 100,000 people is 1.6 in England and Wales, 5.7 in the US.
That's for all murder and manslaughter in England and Wales, but excludes manslaughter due to negligence in the US, so the US rate would be higher under British counting rules, the England and Wales rate lower under US counting rules.