the compliance plate can't tell you anything other than it's a Mini S, but the LS and SS models wore the same plate, so the other identifiers you've picked out are the only details you have to go on. I'm not up with square nosed minis, but I thought all of the 998 LS' were either blue or gold, so yours must be an SS ?
ripped from one of Morris 1100's old posts (I miss him)
022 = Leyland Mini S (or LS or SS)
D = Nothing important!
2S = 2 Door Saloon
1 = Trim Quality level 1 (Leyland Mini S will be a 1 or 2. )
M = 4 Speed Floor shift Manual
09 = 998 Engine.
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did I tell you that I won a
trophy?