A good place to start:
How much it is going to cost is a rather impossible question - it depends on your travel style and preferences. Flight prices vary from one day to another and you are mighty late with booking for this month given the fact that you plan to travel in peak tourist season.
" Would it be cheaper to take a train from London to Oslo?" No, definitely not. From the UK to Norway train travel will be both a lot more expensive and also a lot more time-consuming than cheap flights. You can still find flights London-Bergen at the end of July from about 1200NOK (115£) with Norwegian, from about 900NOK for London-Oslo with the same company.
Bergen is the best place to fly to to explore the most famous of Norway's attractions, the fjords.
thanks, iverh. Really appreciate your response.
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