As quick as Lenovo has been to hop on the Ultrabook bandwagon, it hasn't been so eager to launch big-screened models. Its new ThinkPad S531 explores that territory at last: the Windows 8 PC mates a slim profile with both a 15.6-inch, lay-flat LCD and a large keyboard. The experience will otherwise be familiar to those who've seen the S431, as it shares the same basic design language, the OneLink dock connector and a nine-hour battery. Unfortunately, the similarity also extends to the Ivy Bridge-era Intel processor -- there's no Haswell inside, at least for now. Still, the £575 ($900) UK price is within reach of many buyers, and there's a 1080p display option coming in July. Lenovo hasn't said if or when the S531 will reach the US, although we hope it gets a processor upgrade if and when it crosses the Atlantic.