No Tech Pack, Pete B as it was a silly price on £1500 and the Roof was bad enough......although I would pay the same again on the G4 if a roof was available. It is available on the Advanced Tech Pack in the States on the Prius 3 & 4.
The roof was great for ventilation, with just the back end flipped up, as you could feel the dash board face vents really allow more air to enter, as they were working against less resistance.
It seems to be the ability to put feet right under the front seats that makes all of the difference to rear seat comfort........but not having a height adjust on the passenger seat of the Excel is really poor, comfort wise, as every leg and torso length is different.
M y wife may have to go back to using a Back Friend, which is really excellent, but shouldn't be necessary
https://www.medesign.co.uk/MEDesign-Backfriend