The UK 47GHz primary amateur allocation runs from 47,000 - 47,200 MHz. Most of the band is all-modes with the centre for narrowband operating at 47,088.2 MHz.
- 47GHz Brief: A useful overview is available at http://rsgb.org/main/files/2016/10/RSGB_47GHz-brief_160824.pdf
47 GHz Operating
Almost all operating is by portable equipment from high points inc CW/SSB and ATV
See the  for full details.
There are a number of narrow band beacons licensed in the 47 GHz band - see this page for an up to date list.
47 GHz Equipment
At the moment the only commercial option is the range of DB6NT equipment, but this is expensive for the average amateur. It is possible to make short range QSOs on the band using simple mixer transverters and multipliers but range will be limited. An example of such equipment can be found at http://www.rfdesign.co.uk/microwave/Content/Simple%2047GHz%20Transverter2.pdf
47 GHz Power amplifiers
These are really specialised and expensive at the moment. There are few surplus options that can be modified without expensive test equipment
47 GHz Antennas
Small high accuracy horns or dishes are used on this band. The latter can be constructed from items such as lamp reflectors.