Hi Pauline!
I didn't know Daniel Mclean,but wonder if an old real canny fella called Jackie Mclean,was any relation,he was a Deputy at Bedlington A pit,when I started there from Choppington pit in 1965,and he was an old-timer then,maybe in his 60's,which was old when I was only 21 yrs old![young now that I am in my 70's!]
His Daughter,Nancy,was a lovely P.E. teacher [very young then],at Westridge School in 1956 when it opened as a brand new school.
Might be of some help in some way!..[even by elimination!]
Best of luck in your search!