[Vegpot]

I got random sized carrots, but the biggest ones aren't necessarily the ones with most space, nor the smallest the ones with the least. :S

Me too!  Some of the largest ones are touching and squashed up next to each other, and some of the smallest have got room around them - must be the individual seeds I suppose!

[luckypurplebutterfly]

I have been growing carrots in tyres lined with a plastic bag and filled with soil/compost mix.

Do you stack a couple of tyres on top of each other? Surely one wouldn't be deep enough? I guess you use a few tyres widthwise as well as you wouldn't get loads out of just one tyre. We have a tyre place in walking distance from my patch so I might give it a try too as I have lots of clay.