Recently I got a reply, which basically said: this set of lights was never designed for cyclists, and we're not going to do anything about it (text pasted below).
I'm not sure what to escalate this. Any suggestions? I'm sure replying to say that there is still a problem is unlikely to generate a more useful response.
Reference number: 1599118
Location: LADYMEAD, GUILDFORD
Details: Traffic Operations - Other
I am sorry that it has taken so long for us to give you a full reply to your enquiry.
There are currently no reported faults on these traffic signals.
The traffic signal timings are set according to Department of Transport guidelines for the layout and dimensions of the junction. Unfortunately these are mostly calculated based on vehicular movements rather than cyclists. I have checked the timings that you mention and can advise the following:
The intergreen (time between the greens including Amber time) from Europa Park to Woodbridge Road is set to 5 seconds and 6 seconds. It is not easy to adjust these timings as this junction is part of our SCOOT region for all the signals in that area. It could potentially affect all of the other signals in the region. Also if we were to increase this time period it may result in a higher risk of drivers jumping the red as they become impatient.
The detectors on the approaches to the traffic signals should detect bicycles and motorcycles. However, there are no additional detectors within the centre of the junction so it is wise not to cross the stop line just as the signals are changing when on a bicycle.
I am sorry if this is not the reply you were hoping for but please come back to us, quoting the above reference, should you feel that there is still a problem.