Thanks for your good wishes, everyone.
I agree that a vegan diet is unlikely to lead to constipation but I do wonder about deficiencies in small children who are vegan because it's a family thing.
I'm hoping that with the rise of vegan and gluten free diets the endless food programmes on TV might change tack and not just offer us different recipes but information on sourcing ingredients and their nutritional value.
I watched MasterChef last night and apart from the peanut butter (made with oil) it was just same old, same old.