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In 1891 my grandfather was living in Routledge Terrace, Ryhope. He and his mother lived in other Ryhope streets which I've found on the NLS online 25" OS maps, but I've been unable to find Routledge Terrace, and wondered whether anyone could help, please.
(Incidentally, my grandfather died in 1913 as a result of accidentally falling downstairs at his home in Hugh Terrace after 2 glasses of beer and a small port!)

What a surprise to receive a reply to my post, which I'd completely forgotten about! I bought my copy of 'Newhouses revisited' from Whitehaven Record Office when I spent a day there in 2016, but copies are available on ebay. The book includes a chapter on the Unthank family, and looking more carefully at this I see that the reformer was actually Thomas Unthank, the brother of John Unthank. As Sarah said, John died in the 1819 Kells pit disaster, shortly after the birth of his daughter Elizabeth, who later married Samuel McCourt. I found 10 McCourt children born between 1840 and 1852, all with MMN Unthank, so presumably the children of Samuel and Elizabeth, including a Gilbert born in 1856.
I took an Ancestry DNA test last year, and I have matches to ancestors of 2 of Gilbert McCourt's siblings: Isabella (1840-1911) and Joseph (1845-1922). So it does seem likely that my 3g grandmother Mary McCourt (who married Peter MacClorey in 1828) was related to Samuel McCourt. (I initially thought that Mary McClorey, nee McCourt, died in 1875, but I have more recently found a Mary McClurry in the 1881 and 1891 censuses, dying in 1892.)
The 1841 census shows Mary McCourt (c1788-1859) living with sons Joseph (b c1826) and John (b c1828); in 1851 she is with son Joseph and daughter-in-law Augusta.
So were Mary, Samuel, Joseph and John all siblings, the children of John McCourt and Mary Holmes, or was the relationship more complicated? Baptism records might show, but they're not easily available, though it's good to know that there are some Whitehaven records on FreeReg (for which I do a bit of transcribing). One family tree says that John McCourt (1784-1830) came from Ireland, so they may well have been Catholics. I know that Mary's husband Peter MacClorey came from Ireland and was buried at St Begh’s Roman Catholic Priory. Perhaps another trip to Whitehaven Record Office would help?

Thank you very much for that, dathai.  I am so excited to think that I have found Mary's death at last - and most frustrated at still not being able to see the image.  I hadn't realised that you can now see the images online - had previously bought copy certificates. 

With an approximate birth date (consistent with that on the 1901 census) I have a better chance of finding her in earlier English censuses, and her birth. I do wonder, with such a wide age gap, whether it was a 2nd marriage for Mary too?

Thank you so very much, Sinann and dathai, for your helpful comments. These do make the 1901 census entry I found seem more plausible, and Hardy to be the more likely option.

I  was really keen to look at the image of the 1909 death certificate, but the computer just kept producing a 'not found' message - not sure whether it is my computer or a temporary problem with the website - very frustrating!  I don't suppose you could give me any more details of what you found, please?