Thanks to those who replied. This was a well worth while job and pretty easy to do, even for me as this was by far the biggest job I have done on a car ever.
I had no instructions for a caldina so had to undo a bolt here and there which was not described in the 3sfe rocker cover gasket replacements FAQ's I used alongside the Toyota manual (which was handy as some people were completely covering the whole of the gasket in gasket sealant rather than just the points as directed by the manual.
There were two complete gaps in the old seal that were leaking oil onto the front of the engine. I also put some gasket seal around the plug on the right side (looking at the engine) as there was none there originally and an oil leak below it.
Pictures of the two places where the old gasket was cracked:
I also replaced the spark plug seals as suggested. Thanks for that.
The only problem I encountered was that the coolant temperature sensor connector was very friable and must of disintegrated when I took it out with lots of plastic remnants left in there. I had to remove the temp sensor, put my finger over the hole to stop coolant pouring out, turn it upside down, the plastic bits fell out and I was able to use the original wire to connect it up. Works like a dream. No obvious seal problems. Very happy. Time will tell I guess.
