Same over here on the continent ;-). The blue team has developed rigid rules recently.
Keira insists on the left side though. She will always announce herself loudly, EVERY night complaining how I could get into bed without her, trample me for a few minutes and then with an audible flop fall into my arm.
Only time she will settle on the right side is if Leon has been ungracious enough to want some space on the bed, too. He usually sleeps on the floor in a basket but once in a while he tries to get on the bed. Keira either lays down right in front of him or she starts biting his tail until he gives up (this is her favourite MO) and cuddels up in his basket looking really lonesome and lets out a big sigh.
And then god forbid I take pity on him and give him a cuddle. I get shouted at by the madam, sometimes even the gentlest of claws in my back and then she´ll jump down and start hitting his tail in the basket until I give up, try to get some sleep and provide the "right" sleeping position for her.
Can only say luckily my love life has been in a draught for some time now (which I´m not whining about - got little time right now and am moving to a different city in 2 months) but I am starting to worry how may scars a potential love interest might face in my bed

BTW Elaine, gorgeous pictures of gorgeous pussums. Especially love the tortie.