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 Our 6 ‘Best Buys Now’ Shares Image source: Getty Images. “This Stock Could Be Like Buying Amazon in 1997” Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge! While Cash ISAs may be a popular means of saving for retirement, they may not be the most effective strategy. After all, the income return on Cash ISAs is lower than inflation in many cases. With interest rates set to stay low over the coming months, this could lead to a loss of spending power that hurts your retirement prospects.As such, now may be the right time to buy a diverse range of FTSE 100 shares. In many cases they offer wide margins of safety and healthy income returns. Here are two prime examples of such companies that I think could help you to retire early.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…ShellThe recent quarterly update from Shell (LSE: RDSB) highlighted the company’s resilience when faced with challenging market conditions. Gas prices and chemicals margins were weak during the period, although the business was still able to deliver healthy levels of profitability and free cash flow.Looking ahead, Shell may continue to experience uncertain operating conditions. However, it still has the potential to reduce debt levels and invest in its asset base to generate improving long-term financial performance.With the stock currently trading on a price-to-earnings (P/E) ratio of 11.2, it appears as though investors have factored in the challenging trading conditions facing the business. Its bottom line is due to rise by 5% next year, which could lead to improving investor sentiment in the coming years.Although there are more stable income shares in the FTSE 100, Shell’s dividend yield of 6.6% is appealing for long-term investors. As such, now could be the right time to buy a slice of the company while it trades on a modest valuation and when could offer improving total returns.AdmiralAnother FTSE 100 share that could deliver an impressive return is Admiral (LSE: ADM). The motor insurance company’s most recent interim results showed that it is making progress in delivering its strategy. Notably, its European business is growing at a fast pace, while its loans business made a strong start. This could help to diversify its business and may provide access to growth opportunities.With a 5.5% dividend yield, Admiral is an attractive income share. It has a solid track record of growing dividends, while modest profit growth forecasts over the next couple of years suggest there may be further scope for a rising shareholder payout.Certainly, the wider motor insurance business has experienced a challenging period in recent months. Changes to the rate used to set personal injury compensation in the UK caused Admiral to experience a £33m headwind in the first half of the current year.However, with the stock having a high yield and offering solid growth prospects, it could deliver an impressive total return which helps you to build a retirement nest egg. See all posts by Peter Stephens 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. Forget a Cash ISA. I’d buy these 2 FTSE 100 dividend stocks to retire early Simply click below to discover how you can take advantage of this. Peter Stephens owns shares of Admiral Group and Royal Dutch Shell B. The Motley Fool UK has recommended Admiral Group. 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. Peter Stephens | Wednesday, 22nd January, 2020 | More on: ADM RDSB 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.