£780!!!
I'd expect to spend less than 2hours per side doing the job in the street. I say that, because I have, several times. I still have a box with the few parts you don't replace(mainly the rubber isolators and upper spring cup) to build strut assemblies before starting the job, which makes an hour per side entirely feasible.
Personally, I wouldn't be reassembling a 90,000 mile suspension without replacing
all of the wear parts: shocks, springs, top mounts, bump stops, strut bearings, wishbones and track rods. That's because at 90k, it's well past the
nicely worn in stage, and is heading for
distinctly tired. Most of these parts wear imperceptibly, and it can take someone who didn't recalibrate their brain as that happened to point out just how bad they've become. Changing them all, with a proper alignment utterly transforms how the car drives.
Estate doesn't make a difference to the front springs, as they're all the same. Rears are different to saloon, but fitting the non-self levelling springs is a good idea even if the levelling still works(it's essential if it doesn't!).
I could do this
whole job if you don't mind driving around London and into Kent.
Have a pic of all the bits in almost the correct order:

1,4 & 5 are the only bits that are reused.