Hi Ken, Thanks for that; that's what I thought too.
However the website thinks it is running 7.1. I've wound back to 3.3.1 to ponder this.
PS "Be careful about taking advice in other postings and attempting to apply them to your instance ... may not be the same operating system (which means commands won't work) ... that's unless the posting did discuss/show 1and1 hosting." It was on the specific topic of 1and1