Hello bitzar
I haven't really looked further into Sarah Pritchard since my post, but here's what I have ...
Sarah appears on the 1841, 51, 61 and 71 census returns - widowed and with John and Emma in 61 and 71. Going by her census ages she seems to have been born Shifnal c.1795. (Adey was born c.1794, baptised in Wellington, about 7.5 mi from Shifnal).
A Sarah Pritchard died 30 Mar 1876, age 80, at Coal Pit Bank (aka Ketley Bank), so this is probably her.
A possible marriage:
John Pritchard (widower, collier, of Oaken Gates) marr. Sarah Fletcher (née Johnson), Shifnal, 1838. Oaken Gates is close to/part of Ketley Bank/Coal Pit Bank.
Or ... Adey and Sarah could be the same person (in which case marr. 1814, Wellington).
I think I'm favouring the theory that Sarah is Sarah Fletcher, a second marriage for John (b.1791) and John Pritchard's (b.1822) step-mother.
Would be interested in your thoughts - do you have a connection here?
Many thanks - Garen.