[Alan G H]

For a start there are no drag links on your van, but it does have anti-roll bar drop links.
If it was me, I would check all these items myself before ordering any parts.
The drop links usually make a knocking noise going over bumps if they are worn.

 

[Alan G H]

Can you tell me why they have put drag links on the MOT cert as an advisory please if there is none. I'm a little confused, And forgive me that don't take much

You will have to ask the MOT tester that! It seems he (she) is confused as well.
I suspect it could have slight play in the track rod inner ball joints, it may be these that have slight play.
Don't forget, many MOT testers seem to expect vehicles to be in new condition, whereas the testers manual merely expects vehicles to be safe. Slight play is acceptable in many parts.
As I said previously, check all the items for yourself, BEFORE ordering parts.