There is just so much ideological overlap between the big parties these days that Balfe could switch parties without himself moving his position.
This is something I've said myself many times. (Just not as concisely!)
One of the commenters adds:
There are no "parties". There is just one big political class, complete with a full set of emblems, trappings and rituals.
And that truly is Tony Blair's legacy: in a decade, he managed to transform British politics from whatever it been over the last 500 years into a class of grasping, self-obsessed, entirely unaccountable, entirely useless and entirely interchangeable Lego parts.