Doncaster isn't an IECC
Liverpool Street (from Liverpool Street-Colchester/Bishpos Strotford/Branches)
Marylebone (Chiltern Lines till Aynho jn nr Banbury)
Yoker (Glasgow Nortern Suburban Area)
York (ECML from nth of Doncaster till sth of Darlington and Leeds area)
Tyneside (ECML sth of Darlington-sth of Morpeth)
Slough New (Paddington-Heathrow)
Swindon B (Didcot area)
Leamington (Banbury-Warwick)
Ashford (Sth Region SE section and CTRL)
Bornemouth (Dorset coast)
Rugby (WCML Watford Jn-Nuneaton)
Stoke (Colwich junction Crewe/Macclesfied)
West Hampsted (St Pancras area during construction of the channel tunnel rail link)
Upminster (London, Tilbury and Southend Line)
although they are (taken off simsig forum)