Hello,
Finding a baptism / christening may never happen sadly it is all to often an event, there are some parish records for Mary Roberts, Lewes-1860, Rye-1863, Farnham-1865, Westhampnett-1866, not sure if the father is a Samson the two of births at Hastings 1865 and Hailsham 1866 are one I note are living with Brazil's [other spelling] they two lived in Surry, some of the Roberts did move around a lot into Kent, Middlesex and the other way into Hampshire so perhaps a wider scope may help you, Harris well, I have two lines and they are some what of a conundrum, some did become travelling showmen so moved around quite a lot also, Bacon and Gillett are noted only from 1799 as a Gypsy surname but they may have gone under another before that time, I have a friend who is a Gillett who says his family had been Gypsy at one point he believes but long ago, anyhow most of this you may know and another member may be able to help, good luck, I hope you find what you seek.