Sir, – I see the cross-Border bid for Ireland to stage the 2023 Rugby World Cup has received the enthusiastic backing of Northern Ireland’s Deputy First Minister Martin McGuinness. Could Mr McGuinness’s fervent support for the splendid initiative be regarded as a tacit acceptance by him and his party that the Border will remain in existence for some time yet? – Yours, etc, PAUL DELANEY, Dalkey, Co Dublin.