Long shot I know, but will the 6 speed gearbox off a pd 140 engined Golf Plus go straight onto a 110TDi on my Octavia?

Assuming the bolts line up, etc you will need the clutch, flywheel, starter motor, driveshafts and probably half a dozen things I have omitted to mention.

In short then: No

HTH

Think you could use the same driveshafts but you will deffo need the stick and cables plus flywheel, clutch and hydraulic pipe coz they are different.

Jav

Assuming the bolts line up, etc you will need the clutch, flywheel, starter motor, driveshafts and probably half a dozen things I have omitted to mention.

It's doable, just takes a lot of components. In addition to the above you need a different gearbox mounts and the top mount console, you need to bend clutch lines to fit the new position, and a lot of new bolts/nuts (stretch/locking ones are used in quite a few places).

I did 6-spd from PD130 to TDI110 5 years ago. It was a tough job, but to this day I am happy as the 6-speed has a lot better clutch design and the 6th gear saved a lot of fuel in the 4 years the car was used on the Autobahn cruises.

Edit: Driveshafts are different!