A british isles bid could be good. 6 groups as follows:
Ireland - Dublin (Croke Park) & Limerick (Muster's ground holds 26.5k and both ends could easily be developed to make a 35-40k stadium) or a redeveloped NI ground Glasgow - Rangers + Celtic Cardiff (Millenium + Cardiff City) Manchester London (Wembley + Arsenal) West Midlands (Villa + a completed Wolves)
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Ireland - Dublin (Croke Park) & Limerick (Muster's ground holds 26.5k and both ends could easily be developed to make a 35-40k stadium) or a redeveloped NI ground
Glasgow - Rangers + Celtic
Cardiff (Millenium + Cardiff City)
Manchester
London (Wembley + Arsenal)
West Midlands (Villa + a completed Wolves)