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I was going to say something similar to @gbj_tester and was thinking you would need to remove the ballast but there are apparently plenty of direct LED replacements so you might be fine, providing it fits in other ways.
For example https://www.any-lamp.co.uk/osram-dulux-te-led-7w-840-2-pin-replacer-for-7w-4058075559370
jellybaby
hoefla
I did see some need ballast and some don't... Unfortunately I don't have them with me and no photos. They are old Erco desk lamps. Presumably replacing with CFLs is ok then, I just thought LEDs might be nicer.