rotary washing line without concreting it in.

Mankysteve

B&Q do a screw one that you twist into the ground

shown73

Wish I could remember where I got it, but ours has a support shaped like a swastika with a serrated edge, that hammers into the lawn, below grass level, and the pole slots into the hole in the middle. That in conjunction with the spike already mentioned, and it has lasted for years. It must have been from one of the normal diy outlets, worth a look around.
The screw-in one is probably pretty good also.

Pont

I got the Argos one today. I'm going to give it a go tomorrow (weather permitting) - have got my hammer and block of wood at the ready!

molerat

Remember to check several times that it is going in straight as you are belting it.

Mine came with a spike which I belted in then laid the patio over the top with a piece cut out of one of the slabs