Would doing so render my previous action meaningless? I'm not desperate to return, but I honestly think I can help to improve the way the company is run. My employers have said they would take me back.
I should really know what happened to the employee who was unfairly penalised. Did the company ever admit its error and offer compensation?
If so, your action was far from meaningless and your reluctance to return to the firm is unfounded.
Even if the error went uncorrected, I doubt if it has been repeated, so your resignation will still have had a beneficial effect.
This leads me to suspect that what was once a genuine point of principle is now a small, stubborn obsession. If everyone wants you back, if you'd like to go back yourself, if the company is now decently run and if you're confident that you could help it be run even better, then you shouldn't let this little prick of vanity stop you.
Jeremy Bullmore has been creative director and chairman of J Walter Thompson London and a non-executive director of the Guardian Media Group; he is a non-executive director of WPP. Address your problems to Jeremy Bullmore at: email@example.com. Regrettably, no correspondence can be entered into.