wall/ fence mounted work stand

Two long shelving brackets, wrapped in a bit of foam or whatever. One under the stem, one under the saddle. Wrap some Velcro straps around to hold in place.

Ghetto, but it'll work if you're on a budget.

There's an interesting how-to video for making a stand that you can attach to a wall using plumber's metal pipe, a flange, and vise clamps from the hardware store for ~£15 that you might find useful since you wanted a DIY option.

http://m.youtube.com/watch?v=GWErzJehb5A

Yep, i use a wall mounted storage rack bolted in to the fence post next to the shed. Perfect for maintenance and washing. I have a couple of small bar towels that i swiped from the local pub to wrap around the top tube for protection.

It also comes in handy for hanging cycling helmets on to dry after a sweaty summer ride, and shoe covers/ jackets after wet winter rides.

£10 from Halfords, bargain.

I have one of these bolted to the washing line, with additional old bar tape on the u-shaped bits to protect the frame from being damaged. A couple of bolts to install and it's perfect for bike washing and the odd bit of maintenance.

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_...

Would like something that attaches to the railings on my balcony. Any suggestions?

You can get wall mount workstand heads for £20-30 from almost any of the major online players, plus amazon and ebay.

The cheapest option would be a wall mount storage rack... Something simple with two arms that hold the bike can be had for little over a tenner. Ribble do a folding one for 11.99