I suspect you may have the wrong family for Thomas. As you are aware it is submitted in nature.
HO107/41/12 Folio 2 Page 1
Hulcott
AylesburyMESSENGER Richard 49 Y Ag Lab
MESSENGER Martha 45 Y
MESSENGER James 13 Y
MESSENGER Thomas 11 YMESSENGER Joseph 5 Y
MESSENGER Francis 3 Y
MESSENGER Sarah 18 Y
also note a few houses away at Culcott
MESSENGER William 24 Y Ag Lab
MESSENGER Mary 28 Y
MESSENGER William 4 Y
MESSENGER Elizabeth 2 Y
Richard
MESSENGER = Martha
NORMAN 4 Feb 1818 Eddlesborough Buckinghamshire
some possible baptisms I spotted at Ivinghoe
Maria bap 20 Dec 1818
John born 31 Jan 1820 and bap 19 Mar 1820
Richard born 22 Jan 1822 and bap 17 Mar 1822
Jesse born 19 May 1826 and bap 25 Feb 1827
James born 20 Feb 1828 and bap 7 Sep 1828
perhaps William is a son
1851
HO107/1721 Folio 568 Page 6
Hulcott Rd
HulcottMESSENGER Richa Head 59 Mar b Hulcott Ag Lab
MESSENGER Martha Wife 54 Mar b Claydon Bucks
MESSENGER Francis Son 12 b Hulcott Ag Lab
MESSENGER Alfredo Son 9 b Hulcott at home
MESSENGER John grandson 1 b Hulcott
and William and Mary
HO107/1721 Folio 566 Page 3
Hulcott RdMESSENGER William Head 33 Mar b Ivinghoe Ag Lab
MESSENGER Mary Wife 37 Mar b Catton Oxon
MESSENGER William Son 13 b Hulcott Ag Lab
MESSENGER Elizth Dau 11 b Hulcott Plaiter
MESSENGER Anna Dau 9 b Hulcott Plaiter
MESSENGER George Son 7 b Hulcott at home
MESSENGER Chas Son 5 b Hulcott at home
MESSENGER Isaac Son 3 b Hulcott at home
John and fam (ag Lab) in Hulcott aged 32 b Ivinghoe
I can't see Thomas - I see Joseph b Hulcott with his brother Richard in Clerkenwell
Hope it helps
Cheers Kris