Spend as much as you can afford!
Most people choose to buy a cheap first transmitter (Tx) and then upgrade if they get a second model. This will get you started but work out to be bad economy in the long run. You can buy a cheap 2 channel tranny for about £40. However you are almost certainly going to "grow out" of this tranny very soon. (If you do buy a cheap TX make sure that it has dual rates and a servo reverse function.)
Also if you are buying a Tx it is often better economy to buy the Tx only instead of the Tx plus Rx, servos etc etc deal. These "complete" sets look good economy but most models these days will require micro or mini Rx and servos, making the standard sized radio gear which comes with the set redundant. So buy your Tx to suit you (and your budget) and your radio gear to suit your model!
For a "full-house" glider with separate servos / channels for each aileron (2x), flap (2x), elevator/rudder or VTail (2x), the bare minimum is 7/8 channels
Most people choose to buy a cheap first transmitter (Tx) and then upgrade if they get a second model. This will get you started but work out to be bad economy in the long run. You can buy a cheap 2 channel tranny for about £40. However you are almost certainly going to "grow out" of this tranny very soon. (If you do buy a cheap TX make sure that it has dual rates and a servo reverse function.)
Also if you are buying a Tx it is often better economy to buy the Tx only instead of the Tx plus Rx, servos etc etc deal. These "complete" sets look good economy but most models these days will require micro or mini Rx and servos, making the standard sized radio gear which comes with the set redundant. So buy your Tx to suit you (and your budget) and your radio gear to suit your model!
For a "full-house" glider with separate servos / channels for each aileron (2x), flap (2x), elevator/rudder or VTail (2x), the bare minimum is 7/8 channels