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The bridge rectifier values should be higher than your output. 50A 600V is a common value, for example. You need aluminium electrolytic capacitor. One or more wired in parallel to the DC output of...

I'd probably err on the side of caution and go for a 40V toroid.

Theoretically, 40VAC should give 57VDC, and 45VAC give 63.6VDC, however that's assuming perfect mains voltage of 230VAC, however it...

I think you have it spot on and they can all be purchased here http://www.rapidonline.com/electronic-components

It is not that hard to build your PSU. you only need a toroidal transformer, a bridge rectifier, a capacitor and fuse(s) if you want to be on the safer side.

I would go with a 45V 500VA toroid (or...