Hi Trevor
Welcome to RootsChat.
Can't find a link between the Gurney's & William Gripper but perhaps there isn't one, he could have just been staying with them in 1841. As Ray has pointed out, William was christened in Watford to Ann, no father mentioned, Ann then marries John Wood, William is with them in 1851 in Chorleywood where John & Anne can be found through to 1881, looks like Anne died between 81 & 91 as John is a widow in 91. Indexed as Woods on most census.
Gripper isn't a Rickmansworth name & there is only the one family on Family Search. Looks like Anne was christened 26th Dec 1813 to James & Elizabeth Grippor (sic), other siblings to James & Elizabeth are,
Mary Gripper 25th May 1800, Rickmansworth,
Mary Gripper 25th May 1801 Rickmansworth,
Sarah Gripper 3/8 July 1803 Watford,
Joseph Gripper 4 June 1806 Watford,
Joseph Grippor (sic) 7May 1809 Rickmansworth
Jane Grippor(sic) 20 May 1810 Rickmansworth
William Grippor(sic) 26 April 1812 Rickmansworth
Hannah Grippor(sic) 25 May 1817 Rickmansworth.
It would seem that most of these children died apart from Ann & Sarah, if you would like the burials I can give them to you, all in Rickmansworth St Marys Church.
There is also a burial for James Gripper 25 Nov 1832 aged 78, most likely their father.
Hope this is some help & the correct family.
Maddie