Aware that I still need to do my tax form soon...I asked HMRC on Twitter (who I follow as it is helpful sometimes - and they do always reply I find).
I asked about info for filling in tax form if SE for English and Irish company (that pays in Euros, if that makes any difference) and the reply (which I had to wait for whilst they looked into it) is as follows:
"Thanks for waiting. If you're self employed and a UK resident, the UK and Irish income will both be included on the self employed page. You would only need to complete a foreign page if Irish tax has been deducted from the Irish income."
So as far as I am concerned no problems and I will continue to transcribe for Tpro and not worry about tax issues (I didn't think it would be a problem but you never know until you ask).