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Tai is 32 and won't have too much more in him. Pek is on the other end of the scale and in a couple of years will be a top scrummager (as I believe Michael Foley said).
However, in the mean time we could add an experienced, mongrel NH prop to
a) Steady our own scrum
b) Teach the others about cauliflower ears, sinking pints and eating all the pies. And scrummaging.