how does 4.8 compare to what we have had over here?

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We've had stronger, but not for a while.

https://en.wikipedia.org/wiki/List_of_earthquakes_in_the_British_Isles 

I was driving to Tesco when the Folkestone quake hit (mag. 4.3) - and even though I was in the car, and not that close to the centre, I felt it... as the car suddenly moved a couple of inches to the side as I was going along! A weird sensation.

EDIT: 4.3 was enough to cause power cuts and structural damage to dozens of houses in Folkestone.

https://en.wikipedia.org/wiki/2007_Kent_earthquake 

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The 4.8 M would not be particularly unusual for North Wales, Kent, Western Scotland, plus Comrie area, and even parts of North Sea. The strongest recorded earthquake in the UK so far to date was 6.1 M over Dogger Bank on 7 June 1931. 

Japan’s Meteorological Agency has issued its first ever warning of a potential ‘mega quake’ following a 7.1 quake yesterday.
https://www.theguardian.com/world/article/2024/aug/09/japan-pm-fumio-kishida-asia-visit-cancelled-earthquake 
Potential for a quake up to 8 or 9, but obviously no prediction of it happening, just a heightened risk.

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Not exactly an earthquake but the next best thing; a massive rockslide in Greenland which caused a tsunami, and interestingly one that led to multiple reflections off sheer walls in a narrow fjord.

https://www.bbc.co.uk/news/articles/cged3jd8llyo 

The event was actually a year ago but the analysis has only just been published

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