Just looked back at the thread Edd, which test kit did you get in the end?
I still need convincing of the importance for 'most gardeners' to test the PH. I'm sorry if that's negative but to be honest I became very worried about PH only to realise that most of my plants are fine. I use basic PH knowledge and look at what grows locally, don't get plants which are too expensive to loose or not do well, it kind of works ok without the 'science stress'. Obviously for experts and those growing specialist plants who need excellent results PH will be important. I agree it would be nice to know the PH but after getting very wrong results after testing and no disasters happened, I suppose in my case I don't need perfection; happy to be educated still though.
Thanks Mike this must have been a job and a half to compile, well done.