The UK 1.3 GHz or 23cms allocation runs from 1240 to 1325 MHz with the centre of the narrow band operating segment at 1296.100 MHz. The 1300-1325 MHz section is unique to the UK and used by a number of ATV repeater outputs.
See the RSGB 1.3GHz band plan for full details.
There are a number of narrow band beacons in the 1.3 GHz band - see this page for an up to date list. There are also a number of licensed NB repeaters in the band which provide useful off air signals - see the ETCC web site for more details.
1.3 GHz Equipment
23cms is a great band to get an introduction to microwaves and several equipment manufacturers make transverters for 1.3GHz: