Thanks Charles, I was going on advice I had been given, in that it not advised in general to compost bindweed.
I would have thought it was certainly true not to compost marestail.
Anyhow I do compost both of them just not in my compost heap, spreading the love.
All my waste that I deem hazardous (I use that term loosely) goes to the communal heap.
Another piece of advice which is not true, do not compost rhubarb leaves, that is wrong, you can compost them.
It was on Gardeners World that you could do it, I did anyhow. Lots of old wives tales out there, you just have to wheedle your way through them.