In case anyone wanted a full record of the European club matches Iorwerth refereed in addition to the six listed above the remaining six are as follows:
1967-68 European Cup Winners' Cup (20/09/1967) - FC Lausanne-Sports v Spartak Trnava
1968-69 European Cup Winners' Cup (27/11/1968) - 1. FC Köln v ADO Den Haag
1969-70 European Champion Clubs' Cup (01/10/1969) - Kjøbenhavns B v SL Benfica
1969-70 European Champion Clubs' Cup (04/03/1970) - Vorwärts Berlin v Feyenoord
1970-71 European Champion Clubs' Cup (05/11/1970) - Atlético Madrid v Cagliari
1974-75 European Champion Clubs' Cup (23/10/1974) - Cork Celtic v Ararat Yerevan