Decimalisation was talked about periodically for c.150 years before it was carried out. It would be interesting to hear about the objections raised in response to the various campaigns and plans during that time.
There are three old unanswered questions about decimalisation; this is a particularly interesting one IMO:
https://www.reddit.com/r/AskHistorians/comments/25namj/why_did_the_uk_not_decimalize_the_pound_until_1971/
"Were there any negative impacts of resisting decimalization?" Could it have had any impact on British soft power as the Empire was disintegrating?
The others:
https://www.reddit.com/r/AskHistorians/comments/6yquqn/old_british_money_how_did_such_a_complicated/
https://www.reddit.com/r/AskHistorians/comments/2xlht6/impact_of_decimalization_in_uk/