Thanks guys,
I was impressed that a guy bought one of these for his joinery shop last week and came back the next day and bought four more. I have been reading dust extraction threads on many forums for many months but became frustrated that I couldn't put my finger on the perfect system...until I read about Mike's drop box and that solved a lot of problems. So, thanks Mike you've done me a huge favour.
On the subject of thanks, I would just like to give a general 'thank you' to you all because the advice you've given me and other advice I've read has been very helpful indeed.
You are a good bunch.
Brendan