You can trade on x-o.co.uk so I imagine you can trade using most platforms. Presumably listing on isdx was incase they are delisted from AIM so I dont think a nomad is required, otherwise what was the point? Even if they aren't tradable following delisting they can be resisted in the future and that often comes with a spike in the price. It's frustrating, yes, but this is the nature of low value shares.
I can trade my shares on x-o.com, they were available to buy at 1p yesterday, not sure what volume is available, I only had £250 cash in my account which could be fulfilled.
I've had an unfulfilled order at above the last trade for a couple of trading days now and its still unfulfilled so does that indicate the last trade was a sell?