On the 18th October 1966 Dr. Martyn Lloyd-Jones gave an address on evangelical unity under the auspices of the Evangelical Alliance. The address was a plea for visible evangelical unity at the church level (instead of being exclusively through movements such as the IVF/UCCF). This call for putting gospel unity before denominational unity, and before the demands of a gathering ecumenism that fostered doctrinal indifference, was something of a watershed moment in British evangelicalism.
More on this later. But for now let my give a big endorsement to the two volume authorised biography of Martyn Lloyd-Jones written by his one time assistant Iain Murray.
Volume 1 is a great story of how Lloyd-Jones left the world of medicine (he was assistant to Sir Thomas Horder the king's physician) to become an evangelist in a small mission hall in Aberavon during the time of the depression. The stories of conversions from those years are a thrilling testimony to the power of a preached gospel.
Volume 2 is a must read to have a grasp on evangelical history post WWII. For many years Lloyd-Jones was at the heart of the evangelical resurgence. He was the first chairman of IFES, president of IVF during the war years, involved in setting up London Bible College, the Evangelical Library, a great encourager behind the Banner of Truth, and so on.
In fact many of the great things that Reformed evangelicals enjoy today are his legacy.