Thanks for your email. Glad to see you're still reading *****! ;)
I understand your confusion - let me see if I can un-muddy the waters for you.
Every time we commission any contributor, ****** has a policy of buying the copyright to whatever it is we're commissioning outright, so that we can reuse/reproduce the content as we see fit. It's a procedure we've been following for many a moon now - since long before my time, in fact. (You might have come across something similar before in your dealings with other publications - I'm not au fait with all their requirements but I do recall from my time of freelancing, that ACP asked me to sign something similar.) According to my records, you were sent a copy of our conditions to sign and return back in *****, by the editor back then . I've attached the form for you to have another look at.
With regards to not crediting you - that was a disappointing oversight on our part, and a real shame. I wish we had; it would have made us all look better to have had your name attached! Would you be interested in appearing in our next issue, with your top tips for *******? Naturally, we'd be more than happy to shamelessly promote you as an expert in paediatric nutrition!
Luckily I have an appointment with my solicitor next week :)