Hello,
This might not be an issue for those of you in the UK, but here in the land down under, getting replacement "lucas" style glass fuses is a real PITA because of their 29mm size.
Anyhow, after zero success with local parts suppliers and repairers, I have discovered that a company called DURITE that makes them, and they can be purchased online including on e-bay. The company is an English company but who knows where the product is made.
So if you need fuses outside of the UK, just search for "durite 29mm glass fuse" on google or ebay and you should be ok. Just make sure you don't get confused by the blow rating and the constant current rating.