This was cleared up on one of the other threads. The first LHD LB110s had two sticks. These were made from February 1968, but were not exported to GB, except for a few which, I guess, went to operators who insisted on LHD. The first RHD LB110s were delivered to GB in July 1968, and were registered in August, so they got “F” plates. They were single stick, with the splitter on a switch (or was it a valve? This is all from memory). At some stage, the LHD vehicles changed to a single stick. I guess that happened before RHD vehicles were made, so the stick and the actuation mechanism would be available for those vehicles. IIRC, the launch brochure shows an LHD lorry with the two sticks. I’ll have a look for it.
Edit- the August 1968 LB110s had “G” plates, of course. The one-off LHD imports on the “F” plates are the ones which would have had two sticks. If you have one of these, it would make a good museum exhibit. 