Guernsey Raiders will be promoted back to National Two South, the RFU has confirmed.
The sport's governing body used a formula to determine final placings for the 2019/20 season after it was curtailed because of the coronavirus pandemic.
Jordan Reynolds' side had sat top of London and South East Premier on points difference before action was suspended.
But the formula deemed Raiders' rivals Rochford Hundred would finish as champions, by virtue of having more home games remaining.
Guernsey, as runners-up, were considered to have played off against their equivalents from South West Premier and came out on top thanks to a significantly better league record.
It means Raiders will return to the fourth tier of English rugby next season, having played at that level for the first time in their history two years' ago.
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Newcastle Falcons, meanwhile, have been confirmed as taple-toppers in the Championship, sealing their return to the top flight at Saracens' expense.
Jersey Reds will finish seventh, the first time they have placed in the bottom half since 2015, with Yorkshire Carnegie relegated to National One.