Similar to the “Tilley” is the Vapalux lamp, also sold under “Bialaddin”. Try an e-bay search and you may have some success. Use either Tilley mantles, or buy from, I think, Willis and Bates, the lamp manufacturer. (Be careful not to inhale the dust from old mantles as you change them. Use a wet tissue trap it.)
Like the Tilley, this lamp uses paraffin (kerosene) rather than petrol, and like the tilley, it needs methylated spirits to light up.