Enfield Council have recently clarified what exactly is allowed in the blue recycling wheelie bins. The main change is that plastic bags (including carrier bags) and plastic wrapping are no longer allowed, because other materials were being caught up in them.
For obvious reasons, the Council are adamant that nappies, even if unused, must not go in the blue bins, and the same is true of sanitary products. The Council is taking a "Zero Tolerance" approach because of the problems such items cause - see this warning on their website.
More details of recycling and other waste collection arrangements.