Image source: Getty Images. 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. Recession investing: I think these are the best UK shares to buy now Headline numbers on the UK economy are dismal. Office for National Statistics data released earlier today shows that it has contracted by 19.1% in the three months to May, indicating the depth of damage caused by the coronavirus-driven lockdown. It obviously looks like a really bad time to invest. But we at the Motley Fool have repeatedly underlined that in an economic slowdown, which goes hand-in-hand with a stock market crash, some of the best UK shares are bargain buys. If there’s anytime to buy FTSE 100 or FTSE 250 stocks, that time is now.Room for optimismIf as an investor you have remained unconvinced, however, allow me to share more data with you. It’s true that the quarterly rolling GDP numbers look bad. But the monthly numbers are actually improving. In May, GDP grew by 1.8%. I know this doesn’t sound like a lot. But compared to March, when it shrank 6.9%, and April, when it shrank 20.3%, it’s a big improvement. 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…I say this because the increase has happened while the lockdown was still underway. By extension, this suggests that data for the post-lockdown period could be even better. It may even show the wished-for ‘V-shaped’ growth. In fact, Bank of England Chief Economist Andy Haldane already sees signs of a V-shaped recovery. There are risks of a precarious recovery getting derailed, of course, but I think we now have room for optimism about the economy. As I drill deeper into the data, the construction sector’s recovery looks quite encouraging to me. It grew by 8.2% in May, after being the biggest faller in April. It fell by a whole 40.2% during that month. On a quarterly basis, it’s still in a bad state, but the first ray of hope has begun to show. As a result, I think some of the best UK shares to buy now are construction stocks.Best UK shares to buyFTSE 100 Irish construction giant CRH is one example. There’s a lot to like about it. First, its share price has recovered well from the stock market crash. And this is despite the construction sector’s poor performance. Two, it’s last trading update in April was positive. Three, it’s a growing and profit-making company, with operations across geographies. Its geographical exposure hedges the risks to business from concentration in a single economy.Similarly, FTSE 250 landscaper Marshalls is another investment option in the construction segment. Its share price was at all-time-highs before the stock market crash hit. While it suffered in the lockdown, its latest update points to a comeback in activity. Like CRH, it too is seeing rising revenues and is profitable. Unlike CRH though, it’s largely based in the UK. For investors who are keen on UK-centric shares, especially after the construction turnaround seen in today’s GDP report, I think this is one of the best UK shares to buy. Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge! 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Manika Premsingh | Tuesday, 14th July, 2020 | More on: CRH MSLH 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. See all posts by Manika Premsingh “This Stock Could Be Like Buying Amazon in 1997” Enter Your Email Address Manika Premsingh has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. 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. 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