99.999% LBWF will just reject as they always do.
If the OP is willing to take the gamble at Tribunal, or the opportunity arises in another case I would play on the break in the line getting bigger and the lack on the 'end of bus lane' sign. Although not mandatory Chapter 3 Road signs says:
9.3.9. The end of a with‑flow bus lane will usually be obvious through the termination of the
diagram 1049A marking. If considered necessary due to observed driver behaviour, an upright
sign to diagram 964 (S9‑4‑11, see Figure 9-5) may be sited as shown in Figure 9-1. The lane
should normally be stopped short of the Stop line at traffic signal controlled junctions
Observed driver behaviour shows people cutting across the last 10-15 metres. The gap in the line is large, getting larger and compounded by lack of sign it can be confusing for drivers.
You can see from GSV images over recent years that there is no maintenance and the gap is getting bigger - 16 months ago it was approx 1.3m.
If this one goes to tribunal I will go down there myself and get an accurate measurement.
When does a continuous thick white line become not substantially continuous?
Chapter 5 Roadmarkings - edge of carriageway (dashed white lines) Diagram 1010 - has a spacing of 1m (1000mm)
They make over £1m per year from this 183m long 'At all times' bus lane that has 6 - 10 buses per hour at peak times (06:00 - 20:00) and every 15 - 30 mins the rest of the time. The rest of Whipps cross road is single lanes. They can surely afford to fix a gap in the roadmarkings?