Thanks Geoff. Yes it does have the pull out, which is very handy. Rubber hoods do appear to be quite cheap so maybe I'll try that first.

I've managed to lose the hood from my Pentax 16-45mm. (It'll be in a field somewhere near Over Haddon in the Peak District if anyone finds it). I was tad stunned to find that a replacement from SRS costs £55.(sic). There are much cheaper 67mm screw-in hoods available from Amazon and elsewhere but I'm wondering if this will cause vignetting, especially when used with filters. Has anyone had any experience of these screw-ins? Thanks. Mike