Our 6 ‘Best Buys Now’ Shares “This Stock Could Be Like Buying Amazon in 1997” Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee. Investors love shares that increase in value. I’m always on the lookout for shares that could appreciate in price, whether by 1,000%, 100%, or even just 10%. Here I single out three UK shares I think could increase by 25% in 2021. That is a more modest target than others, but I would still welcome any 25% return in less than a year!Here are three UK shares I think could increase by a quarter in 2021.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…A retailer going from strength to strengthThe UK retail space can be highly competitive. That makes the performance of discount retailer B&M even more impressive in my view.The home and gardenware specialist saw a sales boom during the first lockdown last year. But that wasn’t a one-off. Rather, it reflected the strong management from B&M’s leadership team. The company nearly doubled its adjusted earnings for the second half of its most recent financial year. B&M was also elevated into the FTSE 100 index of leading shares.Despite paying out a special dividend of 20p already this financial year, the company recently gave up some of its earlier gains. At around 500p, a 25% increase would take it to about 625p. That is higher than it has been before. But with its proven strength during lockdowns, I expect the retailer to continue to do well. I wouldn’t be surprised to see it gain 25% before 2021 is out. Two UK shares I think could move upFor an oil company such as BP, a lot of the share price movement is linked to the oil price. After a torrid 2020 in the oil markets, the price of a barrel of crude has been moving up lately. The benchmark WTI crude price rose above $50 a barrel this month for the first time since a pandemic-induced crash last spring.That is good news for BP. Its shares have already gained 50% since the start of November. However, they remain significantly below their pre-pandemic levels. If oil prices continue to rise, BP could well be a beneficiary.British brickmaker Ibstock remains in the doldrums. Its shares are around 40% off their high point from the past year. However, housebuilding continues to be very big business. For now it shows little sign of losing steam. That should help UK shares of materials providers such as Ibstock. With its own network of clay mines, the company has a differentiator in a market where it is a key player. That gives it pricing power. In its most recent trading statement it reiterated its confidence in the recovery of its markets over time. I think the company is right to be confident. I believe that by the end of the year, the shares could put on 25% from today’s level.B&M, BP, and Ibstock all look like undervalued UK shares to me. Over time I expect the market to reprice them. I wouldn’t be surprised if any or all of them climb 25% or more this year. christopherruane has no position in any of the shares mentioned. The Motley Fool UK has recommended B&M European Value and Ibstock. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors. I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. 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