Filament availability in UK

So I am new to the world of 3D printing, but I love my P1SCombo. When I ordered it I also ordered a few spools of filament. But I ordered refills, thinking that the AMS came with emprty spools. So now I have refills and no spare spools. So I thought I would order more on spool filaments, BUT hardly anything is in stock.
Is this a temporary situation or is this normal? I am reluctant to but 3rd party filament as so far I have had no trouble with Bambu own.
Any suggestions?