[Merry]

"He can only find the 1776 baptism"

Oh really, is he wearing blinkers?

Here is the marriage:

Marriage: 23 Jul 1801 St Mary the Virgin, Blackburn, Lancashire, England
Thomas Holden - (X), collier, the parish of Blackburn
Jenny Whewell - (X), spinster, the same parish
Register: Marriages 1801 - 1809, Page 15, Entry 58
Source: LDS Film 1278807

Assuming (!) he was a bachelor and aged 18-30 or so, I looked for baptisms in Blackburn and there were 9 matches (1770-1782). I'm sure there would be a lot more if I looked further afield.

If he needs a Darwen connection, then two of the Blackburn baps were for two Thomas sons of William and Betty Holden of Lower Darwen.

As for the Aug 1776 bap in Darwen, it's not even the only Thomas Holden baptised there (in Darwen that is - how many chapels were there in Darwen??!!!) in that year, so I find it hard to see how he only found the one baptism!

There's this other one in the same year:

Baptism: 29 Sep 1776 Darwen Chapel, Darwen, Lancashire, England
Thomas Holden - [Child] of John Holden & Alice
Abode: Over Darwen
Source: LDS Film 1278778

But in any case, why can't his Thomas have originated from Blackburn, or has he eliminated all the Thomas baptisms that took place there?!