Well, what a fucking pain in the arse this was to swap the washers around! It's a nightmare and almost impossible to position the bottom washer under the oil line, as it hardly moves, and there is almost no space to move about. Took me almost an hour to get it re-positioned.
Cranked the engine, no leak. Started the engine, gave it one last nip tight, and no leak.
When I ran it before, you could see the oil seeping out from the bottom on the oil pipe. Drove to work again, and still no leak. Just got to burn the oil off, as you can't get to the area to clean it :-(