I've noticed this too and I'm not sure if it is selective memory, but these 'dry' breakdowns seem more common over the past couple of years. Heat getting swept away with a band of cloud and naff all exciting storm activity, followed by SW/W'erly winds. I am wondering if it is partly because the LP systems are following the kink in the Jet too close to the UK, causing it to head up W of Ireland, rather than having a classic Iberian thundery LOW heading North towards S UK.
18z GFS is going with the Jet and an associated Atlantic LP systems forcing the heat east a little more quickly, but still warm/hot and humid for the majority of next week. Remaining decent enough after that too to be honest (on this run).