The risk is that Lewisham will take this as literal and conclude that people do not want a 20mph zone, nor traffic calming measures in their area.

I would have thought a 'yes vote' on condition of enforcement, etc, would be preferable. The objective should be to get the best traffic calming result available rather than to, pardon me, just to stick one up the Council.
Either way we can't let things continue the way they are. There are still plenty of roads around here where traffic can easily go in excess of 30 and sometimes 50 including Ringmore Rise and Netherby Road. There are humps in Ewelme but they don't stop people racing up and down as a solitary measure. But a clearly marked 20mph zone with a threat of enforcement /fine might go some way towards that.

I would urge people to consider the young and vulnerable in any response that they make, as there are lot of schools in the area, hence a lot of young children around, and it is these groups that have higher risks of critical injury and death from speeds, even little in excess of 30mph. There are so many efforts these days to get kids walking and cycling to school ( the Walking Bus) that we really do need to make sure its safe for kids to do so and hopefully the experience of motorbikes fatally crashing within sight of passing schoolchildren, (Stillness) ,cars crashing into bus stops( London Road) and other dreadful incidences elsewhere in the UK of cars mounting pavements and mowing down passing children and parents, will be few and far between in se23.