I doubt whether any age in the 1851 census can be trusted to be accurate for the Blooms/Knights. Charles Knights, my great-great grandfather is said to be 10 but all the other censuses (including 1841 where hios surname is Bloom) and certificates suggest he would have been born around 16. I don't think the family was particularly keen on giving accurate information to the authorities - not surprising if they thought they might be shipped off to Suffolk at short notice!
The removal order is in the Suffolk Record Office in Ipswich. I haven't seen it but the listing on the Access To Archives site shows him as a linen-weaver with wife Lydia and 2 children, from "St George of Colegate" to Mendlesham. I think by this time you could only be "removed" if you were actually about to become a charge on the parish, so presumably they were broke by 14 April 1829. What I don't know is how they could stop you coming back, if you found a way of getting enough cash to avoid being noticed. They were back within 2 years because their last child, Richard, was baptised in St George Colegate on 29 July 1831 and Lydia was buried on the same day. She died on the 26th, presumably in childbirth, so presumably that was also Richard's birthday.