Sony MHC-V81D Party Speaker. Serious piece of kit - no stated power output, but this has separate subwoofer, midrange speakers and tweeters, weighs 26kg, and is over a metre high. It sat at the top of the Sony range in 2018, and is the predecessor for the current model MHC-V83D, which has a near identical spec. In fact, apart from cosmetic differences it is very difficult to see that they've changed anything at all! V83D currently retailing for £650 on Curry's, Amazon, etc.
Has Bluetooth, DAB radio, a waterproof control pad on the top surface with gesture control, built in 360 degree party lighting, a CD/DVD player, Taiko drums, a karaoke function, etc. Can be linked with other Sony party speakers using the Wireless Party Chain function.
Very good reviews in general. Some are suggesting it's too loud for a house and would suit an outdoor PA-type setting or very large room. It also apparently goes up very high without distortion.
Seems a bargain at the price.