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chez_jay-
It being plastic means it will deform and slip off before you can apply any massively damaging torque, even if it is in a metal BB spanner (try taking off a particularly seize BB with one of those plastic adaptors). Not that it will allow to set a specific torque. Same as when the preload crank cap tool is made of plastic too.
stevo_com
I had success just asking for them in a bike shop. They come with new Ultegra BBs so mechanics either chuck them or stick them in a drawer. The Evans near Kings Cross gave me three and didn't want anything for them. @Dammit bought a metal one from somewhere but over torquing caveats apply if you go that route.