Have our backs politically? Yes. But as far as the general people of the UK go, no, not really.
Theres a HUGE number of people in the UK that still refers to Americans as "colonists", theres alot of nice people to, I've run into a few at Universal Studios, but the general population is deffinitely not pro-American as far as support goes. That's not to say the majority is anti-America, but more neutral than anything, but the percentage that looks down upon America and it's people still stays strong.
As far as Australia go, I've never heard them talk shit about anyone really, so good on them.