Errr... As one who lives in Dorset, I can say I'm afraid you're mistaken there.
That hill, which I believe featured in the TV drama series Broadchurch, is not Golden Cap, but another, called East Cliff.
You were not far from Golden Cap, the highest point on England's South coast, but it is to the West of here.
The location is West Bay, near the town of Bridport. That beach with its holiday-makers and rather brave bathers (it is not very safe for swimming there) might look like golden sands but is actually shingle.
+++
I have visited Norway a number of times, always in Summer, and was lucky enough to see the Northern Lights, once. We were there in late August so the sky was fully dark by about midnight, when the display started and lasted about twenty minutes.
It was very impressive, and not as the photographs may suggest. Each "Light" started as a burst from a radiant point, and developed a curtain effect from what looked like hundreds of very fine, green-glowing filaments. Each did not last for very long, but after the display was over there was a very faint green after-glow in the sky for quite a long time.
I thinki the aurora can occur at any time of the day at any time of year, heavily dependant on what the Sun is doing; but of course need dark sky to be visible.
For the rest of the time we were in mid-Norway, about half-way "up" the country, enjoying mainly the beautiful inland countryside but also some of the spectacular fjord scenery. One of the loveliest roads I have seen follows the coast south from the harbour town of Brønnøysund, until eventually turning back inland to meet the E6 main road to Trondheim.