I remember storms of the late 80's and 90's. I was seriously scared of thunder as a child, and used to wake my Dad up every night there was a storm. Often storms occurred every few days in the hot summers. In the end my parents decided I should confront my fear and took me to the highest point (I'm from South Bedfordshire, so it was Dunstable Downs) to watch a fierce storm. Instantly cured, it was beautiful! And an obsession was born! Thundery storms were definitely more frequent then.
I live in the West Midlands currently, and apart from the now infamous storm in 2010 (was it September? October?) I've yet to experience anything more than the odd rumble or flash.
I don't actually know what my brain fart will add to this thread, lmao, but yeah, there is a trend in less frequent stormy weather in the last 10-15 years. Definitely NOT selective memory when you actively seek storms to watch.