I think you underestimate what it means to him. He bought it with the money from the sale of his house when he divorced his ex. I'm betting there's a whole bunch of jelousy going on there.
Don't get me wrong, bikes a bike, and in no way as important as a car in terms of styling and coolness. But it's his bike, with a personal value as well as a tangible financial one. You didn't say what your huge loan was for, and I can't remember if you say you both work. Budgeting is a pig, which I have found out the hard way like most others. So, get rid of SKY (yes all of it), get rid of your mobile provided if they won't reduce your tarriff when you call them (try it, it's great), shop around for all of the utility/insurance providers. If the bike money would only reduce the loan, not clear it, then get an independent financial adviser to tell you what to do for the best.
Clean the dress, and fix it. Rather not know why it's in that state, but lazy excuses won't help him offer to sell his absolute pride and joy. Kill all your pets, or abandon them on the motorway. Things are so much cheaper then. Do you have a car ? Consider selling it, although public transport probably costs much more than running it.
If he says you spend too much in Tescos, make him do the shop (and carry it back on his bike).