Eleven months isn't a long period to lay one up for. In fact, it's not even long enough to really need any special laying up procedures.
Although, there are one or two small things that will help keep the car in the best condition possible.
(FWIW, I Once accidentally laid mine up for eighteen months with nothing done at all after a sudden health issue meant I couldn't do a typing with it).
Disconnected battery isn't a bad thing, or if you can, having it on a conditioner, will keep it in tip top condition.
Cleaning the car off, engine bay too, followed by a quick spin round the block to help dry off the nooks and crannies. Helps get rid of standing dirt that might trap moisture, oils, greases etc. If you want to be ultra picky, you could give metal surfaces a wipe off with ACF50 or a light machine oil, I suppose.
Oil change will do no harm, again, it'll help avoid acids etc sitting inside the engine. But not vital.
I wouldn't drain the tank right down, you're probably not going to get it right empty, and you're just inviting those sludgy, lacquered areas to form, plus you'll end up with condensation inside the tank and associated rust. I'd always make sure it was full. The tank might be a bit stale in a years time, but you'll soon use it up.
Some over inflate the tyres to avoid flat spots. I didn't, and didn't have any flat spots either!
If anyone volunteers to start the engine for you once a week etc, hide the keys and tell them a polite no! If the car is started, it really needs to be driven.