As others have remarked it’s far from uncommon to find British nationals amongst the ranks of Australian war dead. Australia is a young country, it only came into being in 1901 and the vast preponderance of immigrants pre the late 1940s/50s were from the UK.
One of the most famous ANZACs at Gallipoli, John Kirkpatrick, AKA John Simpson, he of Simpson and his donkey fame was born in South Shields. I believe there’s even a statue of him in his home town.
On the other side of the equation, the man who is (at least to date*) Australia’s most infamous war criminal Harry Breaker Morant was also UK born and bred.
Even in the ‘50s and early ‘60s Australia’s tiny regular army had a disproportionately high representation of UK born British nationals leading to the old joke that the Australian Army was a great little British Army fucked up only by the presence of a few Aussies.
Ian Mountain sculpted some exquisite ALH figures a few years ago and they were IIRC variously sold by War Times Miniatures and at least one other company. The biggest problem was that they were tiny, closer to 25mm and not a good fit with the Brigade Games range either in heft or aesthetics. Speaking of which, only the BG mounted versions are vaguely correct and even then there are detail problems, puttees rather than leather leggings. The dismounted versions bear no relation to dismounted ALH in terms of kit.
Eureka don’t do ALH in 28mm, although they do a 15mm range. They do on the other hand make a small but lovely mounted Imperial Camel Corps range. Hopefully dismounts to come.
Don’t know of anyone else producing ALH in 28mm which is a mystery given thecpotential gaming fodder of their storied campaigns.
* He will likely have some competition in the not too distant future with possible charges hanging over the heads of a number of serving and former SAS members including Australia’s most recent VC recipient.