Smart move getting the advisories done now rather than just before the next MOT imho.
When it comes to parts, I normaly turn to Ebay. CarPartsInMotion are a good store, and often have deals going. As you've a few bits to buy, try
https://www.autodoc.co.uk/ - they'll have what you need.
FWIW Autodoc's youtube channel also has how to videos on the mk1 Jazz that could be useful.
Re brands. I like BluePrint stuff and know folk in the trade that use them. Febi are great too.
HTH