Thanks for your reply. I hadn't, but I just did and the ones I tried to trade are. I tried several times to trade Apple for instance - it looks like I can sell (it has a sell button to the right of my position) but not buy. The other stocks (both US & UK) just say 'market closed', so the market is open for these stocks, I can probably sell, but I cannot buy. Also the 'available to deal' section suggest it is not a funding issue, unless this is not the case (I have unsettled debit to almost the same amount, but I'm fairly sure the problem existed even when that wasn't the case & i had plentiful funds)