Hi folks - I have a 10-plate 1.9 se 4x4 Octavia (105k miles). I've seen a 65 plate 4x4 at 51Kmiles and it's a 1.6 tdi. I like the apparent economy and the cheap tax. Are these any good/are there any issues I should know about? 

They are a bit flat compared to your older 1.9PD engine. I would give it a good test drive to see if you like the drive. At 3 years old it will be needing a haldex oil change.