George,

Heddy BROOK passed on in 2019, according to this Ancestry.com database:
England and Wales, Death Index

Name:	MS Heddy Brook
Gender:	Female
Last Residence:	London, England
Postal Code District:	Sw12
Death Date:	7 Oct 2019

Both Heddy & Henry BROOK were listed in electoral registers at this address as late as 2010, according to info available at Ancestry.com.
Flat 20, 45, Marlborough Place, NW8 0PX, London.

A search for births at:
https://www.freebmd.org.uk/cgi/search.pl
using surname BROOK and spouse's surname GLEICH gets no hits.

Good luck in your search,

Sherri Bobish

Searching:
RATOWSKY / CHAIMSON (Ariogala, Lith.); LEFFENFELD / FINK / KALTER (Daliowa & Jasliska, Pol.)
BOJDA / BLEIWEISS (Tarnow & Tarnobrzeg, Pol.); WALTZMAN / WALZMAN (Ustrzyki Dolne, Pol.)
LEVY (Tyrawa Woloska, Pol.); SOLON / SOLAN / SOKOLSKY (Grodek, Bialystok, Pol.)
BOBISH / BLUMENKRANZ / APPEL / WEINER / ROSENBERG (Vysoko-Litovsk, Brest, Biala Podlaska)