UK vs US:
UK: Landlord's insurance is cheap, tenants pay council tax, if you have a management co they probably don't charge a huge whack for the first month. UK has good landlord/tenant arbitration stuff - fair, IMHO.
US: Varies by state, honestly, but the landlord will pay property tax; AFAIK (and I know everything is negotiable) the mgmt co usually takes 50% of the first month's rent. Some states very pro-tenant, some pro-landlord.
I have a totally non-ideal rental in the UK and, monthly, it gets less than half a percent. Just picked a place up in the US that gets > 1.5%. But I expect appreciation in the UK and none in the US.
IOW: Apples and oranges. I'd say half a percent in the UK is an ok target. Greater than that is pretty good.