Hi Pat,
Here's what I have so far.
Benjamin RICHARDSON married Isabel SOUTHEREN 20th Sept 1747, both of this chapelry.
The SOUTHEREN name appears to be one that could also be Solteren/Solteron/Southeron. according to the transcriptions.
Neither of these people appear in the Baptism listings which start in 1719, they were either born before then or came from some other place.
Benjamin & Isabel had the following children.residence listed as, of Leap.
Rowland, bap 29th Jan 1748
Thomas, bap 25th Aug 1751
Alice, bap 14th Apr 1754
Thomas RICHARDSON married Elizabeth MORTON by banns, both of this Chapelry, service performed by T THWAITES curate.
Witnesses were John BLAXTON & George LECK.
Elizabeth MORTON d/o Wm MORTON of Tanfield Head was baptised 23rd July 1758.
There are two locations given for residences of the children you have listed. At this stage I'm not really sure if they all belong to your Thomas & Elizabeth
Children of Thomas
Thomas bapt 21st July 1782 s/o Thomas of Fryerside, possible death in 1783.
John bapt 16th May 1784 s/o Thomas of Tantove
George bapt 15th Apr 1787 s/o Thomas of Tantove
William bapt 10th Feb 1788 s/o Thomas of Fryerside
Thomas bapt 4th Jan 1790 s/o Thomas of Tantove
Jane bapt 10th June 1790 d/o Thomas of High Fryerside
Robert bapt 11th Jan 1795 s/o Thomas of Middle Fryerside
Smailes bapt 5th Feb 1797 s/o Thomas of Middle Fryerside
I'm still looking for Margaret & Francis
There was another THOMAS RICHARDSON bapt 28th June 1747. He was the son of John RICHARDSON.
If he married and had children then the TANTOVE children listed could be his & not your Thomas's.
OR, he might be your THOMAS?

You have to love Genealogy Eh!
If I find anything else then I will post it for you.
Cheers
Geoff