Hi
Yes, 100 Group did use the B-24. This type plus others is well described in Martin Streetly's books:
'Confound and Destroy, 100 Group and the Bomber Support Campaign' and 'The Aircraft of 100 Group, A Historical Guide for the Modeller' with photos and drawings.
Used as an electronic warfare aircraft, this Liberator B. Mk IV flew with No. 223 Sqn, RAF. Flying in ahead of bombing formations, these aircraft jammed
The web site quoted is an almost verbatim lift from Royal Air Force bombers of World War Two, Volume One, by Philip J.R. Moyes illustrated by James Goulding, Doubleday and Company, Inc. Garden City new York 1968. The main exceptions are the jamming Liberator IV and SAAF mark V (actually B-24J/mark VI) and things like the Liberator being B-52J and L.
In Northern Europe 223 squadron RAF and 36 squadron USAAF used the B-24 for Radio Counter Measures work.
223 squadron reformed in August 1944, the USAAF in Britain transferred 18 B-24H and 10 B-24J for the squadron.
36 squadron was originally the 803rd flying B-17 forming in January 1944, changing over to B-24 in Mid 1944.