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i've just had a look at that maplin 386 kit linked to above and at maplin prices there are less than two pounds worth of components included in that kit which you can find online for half that price. so you would be paying more than four pounds for a (professionally made, quality) pcb and some vague instructions and a disposable plastic box.
if you are going to do it yourself, then do it yourself.
ohm's where the art is