Possibly. I've re-measured it though today in proper daylight and it's 120mm not 126mm - it looks like it's a Suntour Ultra 6 freewheel cassette.
At the worst I'll have a go at re-building it (never done that before), particularly if the spokes keep going.
OK that will be a big jump. I will try doing a search for wheelcraft and call them, also try Brick Lane Cycles as they may have something that works for you,even if its only a spare.