Every teacher in my school is out on the playground every morning for about 10 minutes before the bell goes. This gives parents the chance to get to see us on a daily basis and get to know us (and us, them). Whilst we don't have in-depth conversations in the playground (obviously!), it gives us the chance to arrange to see parents later in the day.
I also go out on the playground every afternoon when sending the children out, so that I have a chance to speak to parents and talk about something positive that has happened with their child that day. This is particularly important when working with children who have difficulties with behaviour. Their parents often hear negative things about their child, so it's so important for them to hear positive things on a regular basis. It makes them far more likely to engage with the school when there are problems, because we have a positive relationship with them.
I think that many of the parents I work with, have had pretty bad experiences at school, and so, are reluctant to engage with the schools again.
We hold half termly open afternoons where parents join us for workshops, led by the children, to share and celebrate that half term's learning. This has really helped us to reach out to parents to show them how school has changed since they attended.
Bianca's comment "they are quite wooly in their approach - things get forgotten, not chased up properly etc - which I find quite disheartening" is interesting.
I completely understand how frustrating it must be, but when I'm told 8 different things on the playground, about 8 different children, it really is hard to remember them all, and to act on them all. I always ask parents to drop into the office and leave a note for me there if it is something that urgently needs to be done that day. Teachers are only human after all - we do forget things