Thanks to everyone, esp. stormyskye for the info. on the shake. Here is another small contribution from my doc. which might be of use. The doc. says that it would be a good idea to put the whey protein in last of all and blend/bruise it as little as possible. He spoke in tons of technical language, which I did not understand, but the basic idea for a lay person like me was that, if the whey powder is banged about too much the process can damage the internal molucules in the whey and so we do not get the full benefit. A bit like good food 'going' off a bit - the nutrients etc., start to decay and so the food is not as nutritious as it could be. So you might like to consider adding the whey as late as possible, or even just stir it in by hand at the end.