Hi Barry
I don't know if this is any help but there are a lot of Quittenton/den records on FamilySearch Pilot site, including the 2 marriages you mention.
Thomas Quittenton aged 35 married Lucy Sutton aged 33, 10 September 1854, Croydon.
Thomas Quittenton aged 28 married Lucy Colgate aged 24, 22 November 1840, Tatsfield Surrey.
I did wonder if perhaps it was the same Thomas in both marriages but I can only see one Lucy Quittenton death on Free BMD.

I have a John Quittenton marrying my 2xGrt Grandfathers sister Ann Brown in Chenies Bucks 1841, he was born in Croydon 1817, could be a connection here.
Maddie