Any Old Iron?

We are needing some lengths of steel angle to use as strengtheners on future seats.
Ideally they should be about 2" x 2" and 3 or 4 feet long.
As with so many things, the price of new steel has increased significantly and since most of this would be buried on the ground, it's appearance is not critical.
These would be much better than the horizontal timbers used on the seat installed yesterday at Breadsall. See photo on previous post.
If you have an old steel framed bed or something similar that would be ideal.

PS Square section steel tubing also required. Two or three inch section, to be used as seat legs. Also we have almost run out of telegraph poles for legs.
And we need some strong wire mesh with hole size about 1.5 inches square for squirrel proof bird feeders. The two inch mesh which we used previously does not keep out baby squirrels, who delight in sitting inside the feeder scoffing the bird food.

Please let me know if you can locate any of these materials.