Personally I would leave, as slice is at thee thickest part of the tyre. But start researching tyre prices, as deals might be had now. Worked as tyre fitter for a few years, and this is only a personal opinion.
Or swap for spare, if you have a full size spare.
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Thanks mate. If it's not a trouble magnet from police/mot point of view will keep it for a while. Can I mix old/new rear tyres or has to be replaced as a pair? Thanks