International Military Antiques have scabbards:

Military Antiques, Military Collectibles and Militaria Indian Army Bowie Bayonet Scabbard- 1960?s FAL Rifle IMA-USA.COM

However, they quoted me a shipping price to the UKicon that was more than the price of the scabbard. Fortunately I have since been able to source one from within the UK.

In the Skennertonicon book there is also a standard 8" blade version of the Indian SLR bayonet, but I have never seen one for sale. Were they a trials pattern or something?

Mark