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@Olly398
Actually its a piece of piss.
(4) is your heating element, in top of big copper drum thing. It is connected up by six fat wires to number (3), which is presumably that cyclindrical thingy ("ceramic terminal box") you mention. If the mulitcore is coming out of there, it leads to whatever is conveniently faded out of your diagram, which is either not important, or safety critical, ha.
By the process of deduction, it can only be the (2) pressure switch,the (1) main breaker (neither likely as they must be within the machine), or an auxiliary connection as RG suggests.