For more comfort, try the 75 Estate, rather than the ZT-T.
And as for "get rid because it's a Rover", well in my 5 year ownership of a Rover 75 Diesel Conn SE, the reason I DIDN't get rid during the 5 years was because it was a Rover 75, and such a good car. Yes it did go wrong, but frankly not as often as my current Saab, I'm sorry to say, much though I enjoy owning the Saab.
I got rid in the end because I simply wanted a change, so I bought a Lime Yellow 9-3 150 TiD Convertible. Didn't think I could get more of a change!!
With full confidence I sold the Rover to my son-in-law, who still uses it for his daily commute to Heathrow, steady speeds on the M25, upper 40's/lower 50's mpg week in week out. Coming up to 190,000 miles now, on a 51 plate.
If you do buy a 75/ZT-T, you must join the 75andZT web forums, of which there are several.
malcolm