Personally I use https://www.purelifestyle.co.uk ... it's not the best, but I just had a look - it had two basic LL foodpacks on there - a bar and a shake - and they're all the same anyway - so you don't need to match flavour for flavour to be honest.
It's a little fiddly but I like it.
Fantastic idea, thanks Sean and Minerva I'm going to take a look at both sites and decide from there - thanks Daisy for the question - I had no idea there were such things as food logging sites