Is that website for international NOTAMs only ? Does the CAA \ AIS provide UK only Notams in database format ?
1) Yes 2)No
The European AIS Database evolved out of recognition that it was a tad daft for every Eurocontrol State to maintain its own NOTAM database. The EAD covers not only dynamic data (NOTAM) but also static data (IAIP, SRD, AIC).
Now instead of each State subscribing to AFTN feeds of all other States' NOTAM it's all done at Eurocontrol. The UK no longer has its own NOTAM database. The EAD is populated with UK NOTAM by UK AIS staff at Heathrow House on the Bath Road using EAD terminals.
AFIK there has never been a database containing solely UK NOTAM, it's always been worldwide.
WRT pulling it down each day that's not hugely clever as you'd always be working with out of date data. When you run a brief on the AIS site it's a live query on the EAD. Basically you're applying filters on the data and if something went into the database 5 minutes before you clicked the submit button you'll get it included in the result if it meets the filter criteria.
drauk I believe was pulling down data every 15 mins or every half hour. If you're interested in finding out more then
Annex 15 to the Chicago Convention contains the data format.
ICAO Doc 8126 contains the encode/decode for the Q codes used in the Q line but I don't know of an online source for that document.
The filtering and display options currently available are limited by the data format, which is what xnotam is designed to address.
Mike