Before Papa buys a new switch ask him to take a LOOK at where the switch is meant to be. On Bluebird there is just ONE switch, but dual pole, so she has, in effect, two switches in one casing (with 4 wires going to it). The simple way to tell is by looking at the wiring. If there is one switch, and a hanging lead with a RED connector you need the second (Push to Break) switch, but if there is one switch, no hanging wires, and that switch has 4 wires going to it you have the dual pole switch (unlikely, based on what you have told us).
I do not know how easy it is to fit that RED switch, as I have not had to do so myself.