You are wrong about needing a return ticket for a UK visit visa. As far as I know it's not a requirement. My wife was never asked if she had a return ticket, the four times she flew to the UK on a VV.
Every country in the Schengen zone seems to have slightly different rules. To me it makes sense to have a return ticket but you need to check if it applies at the Swedish Embassy website. Can the ticket be changed?
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