Blown bulbs/dash lights

hi my son took is k11 on holiday last week why going he went over a pot hole and lost his dash lights and rear lights when he got to the Eurostar terminal he had a blown bulb and fuse changed these still didn't work he got to France and checked fuses the one he changed had blown again so he changed it and they worked on his return a week later he went into a dip in the road same again lost dash lights and rear lights he pulled into services got back in car and the battery was dead he had just driven car for two hours someone jump started it started first turn of key drove for another hour had to get fuel turned car off but this time started no flat battery but lights gone again does anyone have any ideas on this before I go and look at it over weekend.

Cheers
 
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