cheap alternatives to stakes and trellis?

I've seen in my local farm shop Electric fence posts with hooks all the way down.  It seems to me I could use these to string up for supporting peas or with the 6' ones, maybe even runner beans with a net hung from them.  They seem very strudy and are £1 each for 4' height and £2:35 for the 6' ones.

Do you think they would be worth trying? - cheaper than trellacing and much easier to transport to my plot.

Definitely go for it. I use all sorts of things from purchased vinyl coated supports to lengths of galvanized pipe. If you feel some metal or plastic items are a bit gaudy, then buy a can of spray paint for metal or plastic in a brown or green colour and no one will notice your eclectic selection  As for trellises and such, I keep watch for any damaged lattice going cheap at my lumber stores, I'll use various nettings to hold peas and such - season end sales are the best and I really stock up. THis past winter I got 2 carrier bags stuffed with 4-5 ft lengths of poly twine when a garden centre unpacked their live Christmas trees.  Last year I needed sturdy plant supports so I found who had the cheapest 2x4x8's and I bought a load which I ran lengthwise on the table saw into 2x2's far cheaper than purchasing them that way. Auctions can yield some good finds. I got some old turned porch posts from a friend who was throwing them out and they're now refinished as vine supports. Mostly, it's just keeping your eyes open for anything that can be useful.

thanks all

The ones I've seen are very sturdy 1" thick metal poles, and coated in a nice green plastic so they won't look out of place. 

At the end of the day. I think I'll go for it for a tenner.  If they're not strong enough, i can use them for something else.