I am surprised to hear that from the U.K. call sign holder. Most of us know that OFCOM "squeze your balls" by taking away most of the 2.3 and 3.4GHz in the U.K. The compensation is 1MHz extended 2m band 146MHz. In the Germany and Austria they just sweep the wideband transmission on 1.3Ghz and most of the ATV is banned due to treat to the Galileo navigation system that failed recently due to master clocks stop working. 5.7Ghz is polluted with the Wi-Fi and weather radars. Wi-Fi is migrating in some EU countries even to 10Ghz and 24GHz.
To be honest, I do not see much activity on higher uW bands either. Myself, the total QSOs made per year on 24Ghz, 47GHz, 76GHz and 122GHz is not passing the number 20! So what activity on uW bands we are talking about? uW bands are interesting but very expensive. HF is much more used and much more activity. Anyway, soon we will loose the rest of the uW bands we have access to.