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lynx-
Make sure that the bath doesn't move then. A lot of people don't even batten the wall to rest the bath on something solid. Also make sure you 3/4 fill the bath when you apply the mastic/silicon and leave it full of water until it dries.
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thin decorative bead is all that is needed.
Don't expect a thin, decorative bead to have long-term waterprooffness.
The best sealants a DIY-er can get only allow for 25% movement across the joint in total.
A bathful of water plus the bather can easily cause a couple of millimeters of flex, especially when stepping in/out of the bath and the bathers weight is concentrated in the middle of the bath.
Airhead
mespilus
Mapei has been one of the better ones in my experience but it will still get mouldy. These days I use something like CT1 to seal the bath/shower to the walls and then a 'decorative' sealant on top. Makes it easier to cut out every few years.
If you have to cut silicon out there is a great blade available for the Fein multimaster type tools, makes the job much easier and probably worth having now that type of tool has come down in price from Bosch etc. Just be careful with it on plastic shower trays.