Australian built, the blocks etc were imported from UK but machined and assembled here.
However if you bought a NEW block or short motor here (I bought 2), there was NO engine number on it. Unless it was an imported motor, eg Cooper S.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I know in my 1100/1100S workshop manual it has : "Y Australian Manufacture" on the page decoding the engine numbers.

I've always held the belief that 'Y' in the engine number is Oz manufacture (excluding cooper types, which are a law unto their own).

cheers,

Jacob

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'72 Clubman Van - 1022cc, 295 head, 731 cam - Daily Driver
'69 Morris 1100 S - Dinged by a bus, in shed under repair
'64 Morris 1100 - Early 1100, long term project

You are correct, Jacob, although perhaps a better term is Australian assembled rather than Australian manufactured. It's mentioned in various publications, including the Morris 1100 Workshop Manual you quoted.

Here's a page from HYL3262 - the Mini Series parts catalogue:

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ex-NSW Police 1970 MK II Cooper S
VMCI #43