Image source: Getty Images. 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. Enter Your Email Address Global music and audio products company Focusrite (LSE: TUNE) was a winning stock long before Covid-19 came along. In the three years to February, the share price rose around 250%. And the progress was powered by rising revenues and impressive double-digit annual increases in earnings.Why Focusrite’s been a Covid-19-winning stockThe company’s offering has been resonating with customers. And Focusrite’s been a cash-generating growth stock through that period. But when the pandemic came along, sales rocketed even more, as today’s full-year results report underlines. Indeed, for the 12-months to 31 August, revenue shot up by almost 54% compared to the prior year. Adjusted diluted earnings per share also increased by just over 53%.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…During the period, the firm was digesting its December 2019 acquisition of Martin Audio, which it paid just over £35m for. But it did so with ease, repaying the debt taken on to help fund the purchase within eight months. Such has been the strength of the company’s cash generation.Company founder and executive chairman Phil Dudderidge said in the report the business benefitted from growth in demand for music and recording products. He reckons the surge in business occurred because professional and amateur musicians had to work at home or had more time to enjoy their “passion for music creation.”On top of that, the use of Focusrite audio interfaces increased. He thinks that’s because more people have been podcasting and using Zoom and other platforms for creative applications in music. And there’s also been an uplift in film and TV dubbing and radio entertainment where actors voice productions from home.The big question now for investors like me is, will customer demand continue at these elevated levels for Focusrite? And the answer from City analysts following the firm appears to be, no. Indeed, for the current trading year to August 2021, the consensus estimate for earnings suggests a decline of around 17% from the current elevated level.The valuation could drag on the share’s progressAnd the big problem for me is the valuation has rerated upwards by a considerable amount because of the company’s success. The share price is around 937p, as I write, which puts the forward-looking earnings multiple near 37.But, in fairness, even though earnings will likely be lower than the 2020 figure, they’ll still be about 19% higher than those achieved in 2019. So Focusrite is still a growth proposition. But I wonder if the valuation now over-states the ongoing prospects of the business.On balance, I’m cautious about Focusrite now and fear that the stock may struggle to make progress as the valuation potentially adjusts. Indeed, with Covid-19 vaccine-discovery announcements hitting the wires, I think big-winning coronavirus stocks could begin to struggle. Another stock I’m wary of right now, for example, is Covid-19 testing winner Novacyte.Although both these businesses have ongoing potential, I reckon investors could endure a bumpy ride if the world begins to unwind from the coronavirus crisis. So, I’m inclined to watch these two from the sidelines now and look for promising investments elsewhere. Our 6 ‘Best Buys Now’ Shares Kevin Godbold | Tuesday, 17th November, 2020 | More on: TUNE See all posts by Kevin Godbold Simply click below to discover how you can take advantage of this. I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement. Revenue up 54%! Here’s what I’d do right now about this Covid-19 winning stock The high-calibre small-cap stock flying under the City’s radar Kevin Godbold has no position in any share mentioned. The Motley Fool UK owns shares of and has recommended Zoom Video Communications. The Motley Fool UK has recommended Focusrite. 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. Click here to claim your copy of this special investment report — and we’ll tell you the name of this Top Small-Cap Stock… free of charge! 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