Just for interest (mine, probably not yours) I weighed my bikes this morning, with a luggage scale.
I removed frame packs, lights and so on, but not bike computer mounts / wiring etc. Anyway:
So the S-Works might be my poshest bike, but it’s not the lightest.
Just worked out that if I’d gone out on my hybrid just after Christmas when I personally weighed 81kg, with (at a guess) about 1.5kg of winter clothing / gloves / overshoes on, I’d be pushing roughly 11.5kg more up those hills compared to a run out on the Cannondale in summer clothing at my present personal weight of 74.5kg.
Didn’t weigh the Boardman ‘special edition’ but it has a carbon fork so presumably might be a bit lighter than the other Boardman. Or not .. the Cannondale is all alloy, not a fibre of carbon anywhere.