If you were lodging but then became romantically involved, would you have to declare that to your IP as cohabiting or lodging? Is there a vast difference in what your allowed expenditure would be?
Any change in circumstances need to be reported to your IP.
However to answer your question re the difference; your partners income will be used to ensure fair split of household bills etc based on income and my understanding this is similar to a "lodger" so no not alot of difference
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Sharing from experiences of dealing with debt
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