Good to know, Road and Track. I will keep you in mind for when I need parts again as the gaskets have arrived from Japan already. My local Toyota pretty much said we don't stock them any more and wished me luck finding them.
I started the service. Drained the oil, swapped out the low level oil sensor (went better than I expected, the old sensor looked fine, so hopefully its not a electrical fault), flushed the car again with some spare oil and replaced the oil filter. I also wanted to replace the gearbox oil, bought the 24mm socket but I'm weak and can't crack the filler or drain bolts. Hahaha. Looks like I will need a long breaker bar or something.
I'm having second thoughts about doing the rocker cover gasket myself. I removed the air box but have stalled, just feeling a bit daunted by it since I will have to remove/unplug/disconnect lots just to reach the cover.