The OP is in Norwich, UK, if his info is correct. See below blurb on temps. I have lived in that part of the world and would not hesitate run winters year round.


August is the hottest month in Norwich with an average temperature of 63°F (17°C) and the coldest is January at 39°F (4°C) with the most daily sunshine hours at 7 in June. The wettest month is November with an average of 67mm of rain.

If you can live with the thread wear I don't think it is a big deal in such a moderate climates to go year round. Obviously if you are going to tackle the autobahn or the NB-ring it is a different story.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.