I have a very late model – the headstock casting is square not inclined like earlier versions and it’s metric.
I bought it from a friends father who only used it for model engineering and it had lots of tooling.
I have added a Tesla vfd drive and it greatly improved the machine as previously it was a bit underpowered I thought.
Denford used to be with Boxford and when he set up DMT he improved many area’s on his lathe and directed sales to educational establishments especially schools. So some had an easier life than others I guess !
I think it’s a good sturdy machine and serves me well. The nose thread is the same as Boxfords.
The numbering can be confusing !
I have a TDS 1/GB which has a full s/c gearbox and in addition both long and cross powerfeeds.
The L in the number you note I understand means long bed version.
As with all lathes wear is the important factor to look for. A good one is an excellent machine and often cheaper than Boxfords which are better known and much more robust than Myfords (which can also be much overpriced as a go to name).
I would try and get as many unique accessories as possible such as steadies, change wheels, boring table, vertical slide (if required) etc included with sale as not so readily available as say Myfords etc.