The heir presumptive to the Hardwicke earldom is his cousin Charles
Edward Yorke, b. 1951. He is unmarried.
Next in line is his younger brother, James Alexander, b. 1954. He is
married (in 1986) with 2 sons b. 1987 and 1991 making them both
legitimate. These are the ultimate heirs to the earldom.
There are additional males in remainder to the earldom so we won't be
seeing its demise any time soon.
As for Scarbrough, the Earl married in 2007 (although I don't know her
age) and his unmarried brother (b. 1980) is the only one in remainder.
Off the top of my head, I can think of 2 other earldoms in serious
trouble:
Lovelace --the Earl, b. 1951, has no issue and there is no one in
remainder so his passing will mark the extinction of the Earldom
Norbury-- the unmarried Earl, b. 1967 has no one in remainder so at
this point, his passing will mark the extinction of the Earldom, (One
hopes that at 41, he will still marry and produce and heir.
I know there are several others (including Kitchener of Khartoum) that
are in trouble but without flipping through Debrett's their names are
not coming to me!
All information is from DB 2008.
Brooke