Its good stuff Roxy, but hard to get hold of. We are in the same position as you, and locally here it is more dairy farms than anything else, so all we get is silage made! There are enough people locally that make hay, but straw can be hard to come by. We had to go 40 miles yesterday to get 20 wee bales of straw.
I don't normally feed much in the way of pea straw, but if we can get good wheat or barley straw will throw that into the hayracks as well. Trouble is, we're so short of straw now, that they will get none to eat! I know a couple of people up here who use pea straw, but they generally buy in bulk in August/September and get say 200-300 bales brought up. I don't have room to store that amount- never mind the cost! They sometimes do the same with lucerne, but the same applies.
What I have been using is the Horsehage red bag, which is Alfafa/lucerne. They love it and its great, but its quite pricy. I don't use it all year round, but from about now, and take it to shows as a treat as well.
Beth