Could my 6x-great-grandparents be noble?

[MemoryLayne]

My six-times-great-grandparents were Charles Metcalfe Esq. of Inglethorpe Hall and his wife Mary, whose maiden name was also Metcalfe - there's a source that exists to prove they were cousins, first-cousins by the looks of it. Anyway, Inglethorpe wasn't small by any means and I'm wondering whether either of this gentry couple could be of noble/diluted royal blood? Charles ended up leaving upwards of £25,000 [£3 mil today] in his will in 1871, and even for a quite successful solicitor, that seems very rich. I know that he was born in 1797 in Wisbech, Cambridgeshire, and Mary in 1805 in Gainsborough, Lincolnshire. From then it gets a tad cloudy and I haven't found the Metcalfe family in Burke's Peerage yet, or just get back further in general. Since the peerage is kind of my 'specialist subject' genealogically, I've noticed that nearby Cambridgeshire and Lincolnshire families in the 18th century include the Earls/Dukes of Manchester, the Earls of Sandwich (both branches of the Montagu family), the Cromwells and the Barons Willoughby, so I'm thinking any noble descent is probably going to come from those four families.

[shippo]

The Lincoln, Rutland and Stamford Mercury (Stamford, England)
Friday, November 03, 1826
MARRIED
On Thursday the 19th ult, at Gainsborough [by the Rev. G Beckett, the vicar] Mr Charles Metcalfe jun, solicitor, of Wisbeck, to Mary eldest daughter of Morehouse Metcalfe, esq, of Terrace House, Gainsboro.

[wimsey]

the Solicitors' Journal 1871 obituary of Charles describes him as "lord of the manors of Walsoken, Metcalfe, and Inglethorpe in Emneth" and "succeeded to the family estates on the death of his father in 1853". It also describes his father-in-law, William Skrimshire as a deputy lieutenant of Wisbech. The obit. says Charles was born 9 November 1796.

Charles Metcalfe married Elizabeth Skrimshire, November 1794, Wisbech.

Charles Metcalfe senior was 82 when he died in 1853.

.... but you probably knew all of that already .....

[helachau]

1st Cousins?

Morehouse Metcalfe, bap 19 Jun 1776, St Mary St Nicholas, Spalding, parents George and Rebecca - father of Mary Metcalfe
Charles Metcalfe, bap 11 Jan 1771, Gainsborough All Saints, parents George and Rebecca

Charles Metcalfe of Inglethorpe Hall (built 1857) often described as Charles Junior.

[shippo]

Charles Metcalfe married Elizabeth Skrimshire, November 1794, Wisbech.

Oracle and Public Advertiser (London, England),
Wednesday, December 3, 1794

MARRIED
On Monday ?night, Mr Charles Metcalfe, attorney of law, Wisbeck, Cambridgeshire, to Miss Skrimshire, daughter of Wm. Skrimshire, esq of the same place.

[RuthM0]

Noble descent is far more common than you'd think initially, there are several great articles around explaining how pretty much every Caucasian is a descendant of Charlemagne. And also how within a short time period (genealogically speaking) you can get from being a minor royal or noble to a family of farm laborers - due to the eldest son always inheriting everything, and the lack of available nobles to marry