Thanks keelstow, you've been really helpful not least with the links. I'm now considering changing the rear mount after hearing of your experience.

For further info, I've just tried out some Forte diesel treatment on my 1.9D and it's made a fair improvement to its smoothness. I've also took some other advice from this forum about BP Ultimate diesel fuel and have found that using it has made my Polo more responsive and perkier in getting going Can't say it's like an Turbo Nitrous GTi running on methanol, but it has made an improvement