Grewcock was awarded an MBE in the Queen's 2003 New Year's Honours list, along with other players from Bath – Iain Balshaw, Mike Catt and Mike Tindall.
The following season he started four times, covering for Mike Tindall when he was with England or injured.
He formed a centre partnership with Mike Tindall or Mike Catt and notably wore the number 13 even if he played inside centre.
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With injuries to other centres Mike Tindall and Will Greenwood, Smith was tipped by amongst others former centre Jeremy Guscott to take his place in the 2005 Six Nations side.