I find a brilliant looking bike from Yamaha- the Virago 535, for under £2,000:

https://www.autotrader.co.uk/bike-details/202205055384160?advertising-location=at_bikes&postcode=da176ff&sort=price-asc&radius=1500&model=XV535&make=Yamaha&include-delivery-option=on&page=1

And I list my top three picks for a sub £10k Sunday blast motorcycle:

Harley Davidson Softail:

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