After a fair bit of research, I went for a few "Superstands" made by Willworx. You can get them from Amazon but I got mine from BMO Bike-Mailorder.de as they were a bit cheaper and I needed a few.
They arrived after a few days and work a treat. What I like about them is that they are so flexible....I stack the bikes in an overlapping line down one side of the garage (2 bikes deep) but I've also got a couple outside for the kids to drop their bikes into or for me to leave the hack bike in if I'm running errands on it through the day. I also took one to Swinley in the car this weekend and it made the pre-ride fettle easier (no leaning against the car when topping up the fork and shock, checking tyre pressures, getting riding shoes on etc). They work equally well on the front and rear wheels and 2.1 tyres fit in pretty easily.
You can get connectors to link them together but I've not bothered as I'd loose the flexibility.