Eocoelopoma gigas is one of the species of fish which can be found in the London Clay beds, examples can be seen below.
Image accreditation:
References:
https://www.gbif.org/occurrence/1056174956
https://www.gbif.org/occurrence/1056071666
https://www.gbif.org/occurrence/3457654311
https://www.gbif.org/species/8835805
Further reading:
http://www.sheppeyfossils.com/pages/e-gigas-dh.htm
https://www.gbif.org/species/8835805
https://www.lyellcollection.org/doi/full/10.1144/SP430.16
http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=345220