/var/lib/dictionaries-common/ispell/ibritish-large is in ibritish-large 3.3.02-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14  | Language:         british-large (British English - large)
Hash-Name:        british-large
Emacsen-Name:     british-large
Casechars:        [A-Za-z]
Not-Casechars:    [^A-Za-z]
Otherchars:       [']
Many-Otherchars:
Additionalchars:
Ispell-Args:      -B -d british-large
Extended-Character-Mode:
Coding-System:    iso-8859-1
Pspell-Ispell:    en-british-large iso8859-1
auto-compat:      british-large
Locale:           en_GB
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