I haven't read all the posts so apologies if I have the wrong family - but I was actually on Lan-opc when I seen your John and Isabella
is this the right family / time frame ??
Baptism: 6 Mar 1796 Pitt Street Chapel, Liverpool, Lancashire, England
Margaret Clements - [Child] of John Clements & Isabella (formerly Lemming)
Born: 13 Jan 1796
Occupation: Bricklayer
Baptised by: Henry Moore
was Isabella Lemming ? if not - I have the wrong family - and John is a bricklayer - not a Jeweller

added - if it is the right John / Isabella
Marriage: 12 Nov 1791 St Nicholas, Liverpool, Lancashire, England
John Clements - Brick layer, Liverpool
Isabella Leeming - Spinster, Liverpool
Witness: John Wright; Jas.? Boyd
Married by Banns by: Richard Loxham, Curate
Register: Marriages 1788 - 1793, Page 127, Entry 277
Source: LDS Film 93839
Baptism: 11 Jun 1769 St Wilfrid, Melling, Lancashire, England
Isabella Leeming - Daughter of George Leeming & Jennet
Abode: Roberandale
Performed at: Hornby Chapel
Melling is not far from WALTON ON THE HILL ...2 MILES