A number of SSA members are now using the inexpensive FlySky FS-i6 transmitter as a cheap alternative to Spektrum/Taranis/Futaba 2.4 ghz radio gear. For around £35 you get a 20 model memory transmitter and a receiver capable of providing receiver battery telemetry.
Receivers for this radio set range from around £5 for a basic 6 channel model up to £12 for a 10 channel receiver.
A number of very cheap telemetry modules are available providing battery voltage and prop RPM data to be transmitted from the model back to the transmitter.
The transmitter is also marketed under the Turnigy brand name but is essentially the same transmitter.