Naturally as an Englishman I will be wearing the red rose with pride and think with home advantage and a strong and disciplined performance in the Six Nations they could challenge, especially with the benefit of fortress Twickenham.
Having lived in Australia for nine years I should show some allegiance to the Wallabies: though while I see them getting through the group stage at the expense of Wales, I feel South Africa will ultimately be the better side in the quarter finals.
New Zealand should win the tournament as they are just so strong and have so much depth. Ireland offer value as well, and on their day they can beat anyone and you know the Irish fans will bring their A-game especially in the latter stages. South Africa will also be in the mix, especially after their rousing performance against New Zealand in Johannesburg.
So, New Zealand are rightful favourites, but England, Ireland and South Africa can all win given the right conditions.