With the FTSE 100 tearing to new record highs, now could be a great time for investors to splash out on UK blue-chip shares. Here are three I think are worthy of serious consideration this month. In the past 20 years, no current Footsie stock has provided better returns than rental equipment business Ashtead Group (LSE:AHT). The firm has built itself to become a major industry player in that time, thanks primarily to a rolling programme of shrewd acquisitions. And it has no intention of dialling back its aggressive growth strategy. It made 26 more acquisitions in the nine months to January. This is a positive omen. Ashtead’s share price has sunk more than 7% in less than a week. It’s fallen as hopes of interest rate cuts have faded, a scenario that could drag on near-term earnings growth. Following this decline, I’m considering increasing my own stake in the business. The rental equipment industry’s highly fragmented, leaving room for many more profits-boosting acquisitions. And the long-term outlook for the construction industry remains extremely bright. I also like the look of M&G (LSE:MNG) following a significant share price reversal. It now trades on a forward price-to-earnings (P/E) ratio of 8.8...