I have had a look at the paperwork, there are two David Jiggins from Brentwood on the 1901 census. The first who I mentioned was actually 31 years old, living in East Ham and described as a Cost Porter. The second was 74 years old and still resident in Brentwood. It may be that they are both related to 'my' David Jiggins as he married at Bulphan in 1870 which is only a couple of miles from Brentwood.