8.33khz: this was discussed at the UK Phraeology Working Group some time ago. The CAA stated they had no plans to issue 8.33khz frequencies for use below FL195 for at least 10 years and probably longer, all allocations being for use by Area Control Centres for en-route traffic.
There are about 5 allocations in UK Airspace so far.
Having 8.33 frequencies in use means that we have to uses 6 digits when referring to any frequency with more than 4 digits ie '122.3' can be stated as such but '125.25' has to be referred to as '125.250' and '123.225' as wrtten rather than be abreviated to '123.22' as previously; 25khz and 8.33khz* frequencies (*why? My old ICOM was set up for 12.5khz spacing which would have been adequate) have to be stated in full. I argued that as 8.33 spacing was unlikely to be used in class G airspace for many years, we could file a 'difference' with ICAO stating this rule would not apply to traffic in class G airspace below FL95, expecting the MOD rep to support this. Unfortunately he didn't, and as no-one else on the PWG represented GA/class G interests at the time (there was no FISO rep established then) pilots and ATSU's are lumbered with it.