I have put together a generic Peak Flow Diary in Microsoft Excel for anyone to download if they wish.
I know there are plenty out there that you can get from your Doctor, but if you're caught short this may help you. I did have a look on the internet this morning, either I didn't look very hard or I couldn't fine one I could download and print.
highlight the link below and then copy and paste into the address bar in your browser. I can upload a pdf version if you don't have excel. Then click on file > save as...
Please let me know if you found this useful or if there is any information that should be included etc etc.
EDIT (incase you miss it at the bottom):
Ok, here's the pdf version.
Final note, honest! it is designed to print out on A4 although looks huge! in IE! lol.