Sorry for seeming a bit argumentative on this, but regarding:
Can you think of many examples of 2m cycle lanes on busy roads because I'm having difficulty? But my main problem is the wording:
I did already say:
In my experience, the cycle lanes are almost exclusively narrower (and usually significantly narrower) than the 1.5m minimum that applies to 30mph roads, and that is the case even on faster, busy roads where the minimum is supposed to be 2m.
which means that I consider most cycle lanes currently in place to be sub-standard.
Regarding the actual wording:
7.4.2 Cycle lanes should be 2 metres wide on busy roads, or where traffic is travelling in excess of 40 mph. A minimum width of 1.5 metres may be generally acceptable on roads with a 30 mph limit. For cycle feeder lanes to advanced stop line arrangements, a minimum width of 1.2m may be acceptable. Cycle lanes less than 1.2 metres wide cannot easily accommodate tricycles or childcarrying cycle trailers wholly within the lane.
is too vague and open to wilful misinterpretation. It needs to be much more crisp with no wiggle room for interpretation.
I just don't see where the wiggle room is in this. It seems to discuss three scenarios and gives clear guidance for each:
Busy roads, or roads where traffic is travelling in excess of 40 mph: 2m wide
Any other roads with a 30 mph limit (busy roads are already covered above): 1.5m wide
Cycle feeder lanes to ASLs: 1.2m wide (and goes on to explain why these can't be narrower)
It seems pretty unequivocal to me. The only things open to interpretation are: "how busy is busy?", "for non-busy roads with limits between 31mph and 39mph, is it 1.5m or 2.0m?" and "for what distance in advance of the ASL is a cycle lane to be considered to be a feeder lane?". Other than those, there seems to be no doubt, and I certainly see no opening for cycle lanes of less than 1.5m except in the very specific case of ASL feeder lanes.