I'm not a big fan of desert scenarios, and this one doesn't change my mind. With competent play on the part of the British, the Iranians are doomed. This one's probably even more unbalanced than The Bushmasters! Here's what you do as the British. Drive some or all of your armored cars through the sand around behind the trench line. You might bog, and you might get hit with a lucky shot from the MGs, but chances are pretty low if you stay beyond 6 hexes. Move your infantry up to 9 or 10 hexes away on the other side and LET THE ENCIRCLEMENT BEGIN!
Fire from the cars behind (a lousy shot, but enough to encircle) and then follow up with your infantry. Other than the few MGs, they can't touch you beyond 8 hexes, and your infantry can fire at 10. It takes two or three turns to get into position, and then just sit and hammer away for another four turns. With only a little effort, you can position units on each flank to prevent any routing. The broken units just sit in the encircled trenches and slowly evaporate under the fire from your 30 squads (including a 10-2 leader).
The only way the British could lose this one is if they actually try to assault the trenches before clearing them out with fire. You can easily wait until turn 7 before you leisurely walk up to occupy them. As long as you're patient, you'll walk away with a British win. This is the first scenario I've ever played where such lightly armored AFVs were actually useful (1/[0]). Its armor is enough to stand up to a MG, and that's all you need. Maybe this one's a good introduction to the tactics of flanking and encirclement, but that's about its only use.
Marty