Glad it's of use Helen, it's always nice to be able to help fill in some blanks. With a bit of luck it may help locate more relations of Frank's for the CWGC.
As for the 'certain' records, it was a reference to the 1939 Register. Some recordset are under copyright so we're not allowed to post details on RootsChat, and the 1939 Register recordset is one of those. And if we do the moderators will give us a ticking off and delete the posts. However, as Ancestry have recently acquired the rights to the 1939 Register you should be able to locate your various family members fairly easily. If you're not aware, the 1939 Register recorded people's birthdate, rather than age, so it's a useful source to cross check birthdates against birthdates from other sources (eg death registrations).
As for the other records, baptisms are from the parish registers. There are various sources you can find these including
FamilySearch,
FreeReg and
SEAX (Essex Archives).
The probate records are from the government
probate search service. Ancestry and FindMyPast also have these records but I often use this site instead, despite me having subscriptions to both of those services.
The birth registrations are widely available but a while back the GRO made public
new indexes (births: 1837-1917, deaths: 1837-1957) which, for births, include the full name and mother's maiden name (from 1837) and for deaths, include the age (from 1837), details which aren't available in previously published indexes. The site is free to use, you just need to register, but if you've ever ordered any certificates online from the GRO you can use the same login credentials.
The newspaper items are available in the
British Newspaper Archives. The BNA coverage varies from county to county but has very good coverage for Essex, so you should be able to find some more items on your various family members.
And a few more that may be of interest...
Essex Newsman
20 April 1907
Deaths
King - On the 7th April, Henry King, of the Royal Oak, Ingatestone, suddenly, of heart failure, in his 75th year.
Essex Newsman
01 March 1913
Ingatestone and Fryerning
The funeral of Mrs Mary Ann King, aged 79, who passed away on Feb 21 at "Homeward", Chelmsford, took place at Fryerning Cemetery on Wednesday afternoon. The Rev W J House officiated. Deceased was the widow of the late Henry King, licensee of the Royal Oak, Ingatestone, for thirty-nine years. The chief mourners were: Mr and Mrs King, Ingatestone (son and daughter-in-law), Mr and Mrs Ketley (daughter and son-in-law), Mrs Sawyer (daughter), the Misses E. and J. King, Mrs Gillman, Miss Ketley, Mrs Orton and Miss O Sawyer (granddaughters), Mr P King, Mr E Ketley, and Mr F Sawyer (grandsons). Wreaths were received from: Mr H King and family, Mrs Sawyer and family, Mrs Ketley and the boys, Mr and Mrs Gillman, Len and Gracie, Mrs Shaw, Mr and Mrs Clinch (Ealing), Mr and Mrs Hicks, Mr and Mrs Oddy.
Chelmsford Chronicle
09 April 1943
Margaretting
Greetings From Middle East
Mrs E Swayer, of West View, Chignal Road, Chelmsford, who formerly resided for 50 years at the Bakery, Margaretting, celebrated her 80th birthday last week. Among messages of congratulation was one from her grandson (A.C. J.H. Sawyer), serving in the Middle East.
Chelmsford Chronicle
08 October 1920
War Memorial At Margaretting
Screen in Church and Cross In Village
Article about the erection and unveiling of the chancel screen in the parish church and the granite cross in the village, in memorial of the men who lost their lives in the war.
Includes the inscription on the cross:
For God, For King , And Country
In ever grateful memory of the men of Margaretting who fought and fell in the Great War, 1914-1918.
This memorial is erected by the Parishioners.
Bartrop, William B; Beer, Edward B; Booty, George H; Brett, George A; Christy, Thomas H; Chapman, George W; Corby, William H; Elton, Gordon D. G.; Flack, George J; Harris, Joseph; Horseley, Herbert; Rice, John; Sawyer, Frank H; Willis, Herbert J.
"R.I.P."