Hello - advice on acquiring a Commando

Mick, welcome to the club 
Try and get along to one of the local branch meeting venues (meeting places and addresses under the branches link) and introduce yourself. There will be a commando owner who can give you advice on what to lookout for and what questions to ask a vendor.

ask for a ride via a branch meeting:  can then assess handlebar/footrest positions and general feel as you ride it. 
   Also talk to long term owners about the reality of having one. 
   In other words, how can you get ahead of your current info, to help make a more informed choice?

Hi Mick,
its the Yorkshire Branch meeting tonight in Pudsey. We meet at the Marsh Pub on 2nd Tuesday of each month at 7.30pm Lots of us have Commandos and your welcome to come along and ask questions. Might even be able to arrange a test ride at some time. We also have an informal meet at Squires Cafe on 3rd Thursday of each month on our bikes (weather permitting) at 11am.

Dear Mick,
                 there are some known issues you should be aware of and may wish to avoid.
1972 models from engine number starting with a 2 have different yokes/ steering angle, they are more prone to 'weaving' than earlier or later models. Tyre choice can make it worse, you either ride slower or if you have deep pockets rebuild in later frame which can be identified by change in top shock absorber mount. Have a look on Norvil website under tech tips, there is a section under weaving.
      otherwise you are down to looking at condition of what's on offer, all are getting on, but many will have equivalent of service history of rebuilds and receipts  for parts. Obviously when going to look ask to it started from cold and try starting yourself, many on offer may have been stood a while.

Regards Martin

Ps 72 engines don't  have large sump filter for oil pickup, another issue as oil pump can pick up bits of metal, not an issue on earlier or later  models.

... the Mk2A 850 was the pinnacle, with most of the early faults sorted out.

the '72 ones have a small drain plug on bottom of cases. All the others have a very big hexagon plug( with filter built in above it.)  Very easy to spot while you are lying next to it doing a close inspection.....