Posted: 22/03/2013 at 21:29
i'd hold off with the chemicals. Too early for round up, it needs growing leaves to work on. Chemicals that kill baddies fill goodies as well. See what you've got before you kill it.
Bags of B&Q horse maure should be fine, they'll add some bulk. Not sure about the polythene, I'd be inclined to leave for weather to work on but others may have other ideas. It's a late spring, you've done well to get started.