"If you do want a very good Kyffin Williams landscape in this sale, you might be paying up to £20,000 or £30,000 for an example", Bonhams auctioneer Jeff Muse tells our Correspondent Carl Edwards.
"It is a lot of money, but I think what you get for your money is you get an iconic Welsh name, you get a work that will hopefully live with you for many years."
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After a cloudy start, there'll be some bright or sunny spells developing throughout the day. It'll feel warmer than yesterday.
Prime Minister Theresa May announced the decision from Downing Street.
A fairly cloudy night to come with hill and coastal fog lingering in places. This could be thick enough for the odd spot of drizzle.