@oohnicevase
Why do you sublet a room, why not just rent a smaller place on your own? I can't imagine living with someone I didn't get on with .. must be painful!!!
Yep this! It's hard enough sometimes living with someone you DO get on with!
@EachandEveryone Is it an option move to something smaller/cheaper? Long term subletting has got to be a ballache.
And yeah I think subletting is pretty much illegal, but not if your LL knows.
DD and her boyfriend rented a 2 bed flat several years ago, (£500 a month.. £250 each...) After about 6 months, they let their friend in too (he had the other bedroom obvs,.) They said 'this means we only have to pay around £166 each.'
But the landlord put the rent up by £160 - to £660! So they had to pay £220 each!
It was still £30 less than they were paying though, and he was allowed to do it apparently, as it became a new contract with the 3 of them, but the main reason they let their mate in was to lessen the rent. It never occurred to them that the landlord would put the rent up, and they'd hardly be saving anything! In addition, they found their mate hard to live with, and clashed a lot, and they regretted it within a few weeks.
So at the end of the next 6 months, (when the contract was up for renewal,) they gave a month's notice, told their mate they were leaving, and moved into another place together. Said mate is still there, living with the same flatmate who moved in 4 years ago when DD and her boyfriend moved out.
They are all friends though. 
I wish you well @EachandEveryone I hope everything goes well for you and you find another flatmate soon (if you can't move to somewhere smaller/cheaper that is.) 