Re: Fine when not in bus lane/turn to Sainsbury’s
From the following it seems to me that there's a 30 m broken line prescribed, as in the RH part of figure 9-1. (The diagrams cited are in TSRGD itself. Diagram 1010, for example, is simply a line of 1000 x 200 mm dashes, printed at [www.legislation.gov.uk
1.1.1. The Traffic Signs Manual (the Manual) offers advice to traffic authorities and their contractors, designers and managing agents in the United Kingdom, on the use of traffic signs and road markings on the highway network. Mandatory requirements are set out in the Traffic Signs Regulations and General Directions 2016 (as amended) (TSRGD).
9.3.13. Where a nearside bus lane passes a junction with a major left‑turning flow into the side road, the line to diagram 1049A should be replaced with a broken line to diagram 1010 (see Figure 9-1). The broken line should commence 30 m in advance of the junction, and have the same width as the line to diagram 1049A. It should be accompanied by the arrow to diagram 1050 indicating a left turn (see Figure 9-6). At other junctions, the diagram 1049A marking should be terminated approximately 10 m before the junction (or at the junction if the minor road is one‑way towards the major road). In each case the bus lane recommences beyond the junction in combination with a marking to diagram 1010 (see Figure 9-1). It is important to ensure that the marking to diagram 1049A is terminated correctly, so that drivers turning left can move across to do so safely without needing to cross the continuous line.
--Traffic Signs Manual, Chapter 3 (2019) [www.gov.uk