Needs a top up, which oil is best? I am on time and distance service.

Any oil meeting VAG standard 507.01 will do. As you have a diesel with DPF, service regime is irrelevant and the oil used is the same regardless of regime.

Mobil 1 ESP 5-30

Castrol Edge 5-30 fst

Fuchs Titan GT1 longlife 5-30

Millers XF longlife 5-30

Just make sure it says VW 507.00 on the back

Here's one in the For Sale section - http://www.briskoda.net/forums/topic/228285-shell-helix-ultra-extra-5w-30-premium-fully-synthetic-engine-oil/