I am assuming that you use the curved warner blades with the flared edges that get into corners without damaging walls or skirtings. The type that you sharpen with a file.
The last time I got these was in the States.
If you go to
www.econtractorstore.com you will find them on page 7 under blades knives and scrapers. You should be able to get them sent out.
Warner scraper blades 
