The 2005–06 National Division One was the 19th full season of rugby union within the second tier of the English league system, currently known as the RFU Championship. New teams to the division included Harlequins who had been relegated from the 2004–05 Zurich Premiership, while Doncaster and Newbury were promoted from the 2004–05 National Division Two. Additional changes saw Penzance & Newyln RFC rebrand themselves as the Cornish Pirates as well as moving from their home ground, the Mennaye Field in Penzance, to a more central location in Truro at the Kenwyn Rugby Ground (a temporary stadium built in the city) with the aim to appeal more to Cornish fans on the whole as well as making home games more accessible. Rotherham Titans also rebranded themselves as 'Earth Titans' for sponsorship p