This sort of 'issue' is exactly why so many people get so pissed off with the church. A few weeks ago I heard a C of E representative (someone from Rowan Williams' office, I believe) talking about the Back To Church campaign which they'd launched. The idea behind it was that people who don't go to church do so because they don't think church is for them. And that people who do go to church don't invite their non-believing friends because they don't want to overstep the mark.
I think this man was deluded. The reason why most people don't go to church, IMO and IME, is because all too often church is a load of crap. Far too many churches waste time, energy and money arguing over pointless minutiae like this, and completely ignore the fullness of what God has commanded us: to love him with all our hearts, minds and souls, and to love every single other human being as much as we love ourselves. If we really, truly made those two commands the be all and end all of our lives, would we have time for arsing around over who is entitled to take communion and where, and is there an ordained minister around because if not it's virtually illegal, etc, etc.? Really? Jesus did not come up with this bullshit - we humans added it to our faith and it offers absolutely nothing of benefit to any living soul.
I write this as a lifelong and dedicated Christian who has just started going to church after several years' absence.
Just take the communion if you want to - let the matter be between God and you, and leave all the unnecessary nonsense to people who have nothing better to occupy them.