You can see a wide range of boosters and repeaters etc at good prices in Maplins, you could get units that plug in to the mains and re-transmit... unless there's a real reason for being in the dining room then you could move the router and use a longer cable to connect to phone socket... I use the Sky router and it's pretty good, I'm getting wi-fi connection throughout the house and in front/back garden quite happily with router in bedroom on first floor...
It is possible that the router may be low signal etc so you might also try to get Sky to check things out...
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