and it is here!
it arived this morning, and is now set up. it is a lot more comfortable, for sure and provides a lot more support (this one even has arms and my other one didn't!), so I'll see how I get on with it.
in other news it's been raining all night. it's what we've needed though- it's really cooled the air and it's going to rain some more today I think (it's really quite cloudy)