Pr enables politicians to ditch their parties

The power of the fptp parties rests in only one candidate having a realistic chance to do well in a constituency. If a constituency has multiple seats then a party will need to consider whether to field more than one candidate. It no longer becomes such a priority for the politicians themselves to be craven to the parties... they can go elsewhere and being chosen by the party is not such an advantage. To be selected by the party is important only because we do not have pr. The politicians can ditch the parties once pr arrives.