Assuming you can get 200Mb/s speeds from any Openreach-based ISP (which Sky will be) then that's the choice you have to make, and will be the judgement/gamble that VM retentions make when negotiating with you. Is the hassle of changing, worth the saving you make. Only you can decide that.
I would certainly suggest that you ensure you have working service from any chosen new supplier before your VM service is disconnected. I'd rather pay 2 providers for a short time, than risk not having a working connection for however long.
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