Hi Jan
From the Baptist Church book
1719 December the 3d at our church meeting we received Thomas Carver of Southill
1737 Oct 28. Conveyance of the Meeting House from the old trustees to the new trustees, one of whom was Thomas Carver labourer of Southill. In a further conveyance on 20 Nov 1765 he was not listed among the surviving trustees, so it was presumably him who was buried in 1762.
1741 April the 30 Received Mary Carver wife to Brother Carver of Southill
1756 June 17 Received John Carver of Southill Warrin
1757 June the 16 At our church meeting Brother Thomas Carver was ordained Deacon* see end
1762 25 Nov .....Brother John Carver** called to the office of Deacon; and
1763 20 Jan, John Carver accepted the call of the church and was admitted to the office of a Deacon.
1764 25 Oct the church called brother John Carver to preach before them having for some time exercised his gift in private in his own house and unanimously called him to a public preaching the word where providence should call him.
...after Mr Field's Settlement (he was Pastor 1763-74) Mr John Carver, a native of Southill, and who had been chosen Deacon before, was called to the work of the ministry of this church. He was a worthy man, and a good preacher. He was for many years Pastor of the Old Independent Church. at Wellingborough at which place he died. (Can't tell when this was written)
So that I think establishes that they were a very serious baptist family, which explains why, as I'm sure you've seen on the IGI, pre 1812 there's not a single Carver baptism in Southill parish register.
The marriages in the PR transcript are as follows:
11 Feb 1655/6 William Carver & Margaret Usher by Justice Whitbread
20 May 1754 John Carver & Ann Dunton both of Southill (I have Southill Duntons in my tree. Big baptists as well - a nightmare to trace!)
26 Dec 1765 Thomas widower m Mary Vintiner widow , both of Southill
27 Nov 1780 Joseph Negus of Bedford St Peter m Mary Carver of Southill
Banns were called 16 Dec 1781 for Susan with Robert Tarry of St Mary Bedford (despite the member submissions on the IGI these were banns only with no trace of a subsequent marriage)
Burials
2 Aug 1728 Rebecca, infant, dau of Thomas
9 Nov 1750 A child of Thomas Carvers
7 Dec 1758 Mary wife of Thomas
5 Sept 1760 Susan wife of Thomas
27 Mar 1762 Thomas "D" (=Dissenter?)
30 Mar 1765 James, infant, son of John & Ann
14 Nov 1765 Elizabeth, infant, dau of John & Ann "D"
20 Apr 1794 Thomas labourer
5 Apr 1811 Mary
If Samuel was from Southill and was born c 1730 in all likelihood he was the son of Thomas. Proving it is a different ball game.
I'm afraid it was as I suspected it might be - marriages/burials but no baptisms. Are you good at 3D jigsaw puzzles with some of the pieces missing? (in fact it looks fairly straightforward. Pity there's no reference to Samuel, but your apprenticeship record links him pretty firmly with Southill).
A Thomas Carver m Susan Turner 4 Dec 1746 at Lower Gravenhurst (about 6 miles across the fields from Southill)
Good luck
David
PS What about the Samuel Carver marriage in St Ippolyts, a mile south of Hitchin, in 1754?
* Someone on the net has this Thomas as born 1733 (which I think judging by the 1746 marriage above is too late). I think it was Thomas the elder who was the Deacon. There's no sign that Thomas the younger was ever a church member, although he may well have been part of the congregation
**this fits with the burial of Thomas the elder, Deacon, earlier in the year