Certain microwaves are exceptionally good wifi jammers due to leaked radio frequency noise in the 2.4 GHz band. Remarkably the international standards for such things appear to regard this as acceptable, and it can apply even to premium microwave ovens bought recently (a cheery wave here to Panasonic's R&D department, who evidently haven't heard of wifi yet). There may also be harmonics of the primary 2.45 GHz frequency used by may microwaves that will affect 5 GHz, but without a spectrum analyser and the skills to use one, I'm hypothesising regarding 5 GHz.
Hopefully somebody else can explain where you stand on wifi boosters, and what your options are.
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Wifi pods are free to customers on the Ultimate Oomph or Gig1 bundles.
Otherwise they cost a non-viable £5 per month.
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