This is the full list of the London control ATC Frequencies, a map of the areas can be found HERE

ServiceFreqChannel
London FIR118.4750118.480
Southern CTA118.4750118.480
London TMA 1 3 7 16 17 18118.8250118.830
London TMA 1 2 3 4 5 6 10 19119.7750119.780
London UIR119.7750119.780
London FIR120.1750120.180
London TMA 8120.1750120.180
Portsmouth CTA 6 10 11 13 17 18120.2250120.230
London FIR120.4750120.480
Daventry CTA 10120.5250120.530
London TMA 1 3 8 13 20120.5250120.530
Daventry CTA 14 15 16 17 18 19 23 24121.0250121.030
London TMA 19121.0250121.030
Southern CTA121.0250121.030
Clacton CTA 2 3 4 5 6121.2250121.230
London FIR121.2250121.230
London TMA 3 6 7 8 9 10 16 17 18121.2250121.230
Southern CTA121.2250121.230
London FIR121.2750121.280
London TMA 1 3 19121.2750121.280
London FIR123.9000123.905
London TMA 1 3 7 16 17 18123.9000123.905
London FIR124.9250124.930
London TMA 7 8 9124.9250124.930
Berry Head CTA 3 4 5126.0750126.080
London FIR126.0750126.080
Upper Airspace CTA126.0750126.080
London FIR126.7750126.780
Upper Airspace CTA126.7750126.780
London FIR126.8750126.880
Daventry CTA 21127.1000127.105
London FIR127.1000127.105
Midlands CTA127.1000127.105
Southern CTA127.1000127.105
London FIR127.4250127.430
London FIR127.7000127.705
London FIR127.8250127.830
Portsmouth CTA 3 4 5 6127.8250127.830
London FIR127.8750127.880
London TMA 1 2 3127.9500127.955
Southern CTA127.9500127.955
London FIR128.1250128.130
North Sea CTA 1128.1250128.130
London FIR128.1583128.160
London FIR128.4250128.430
London TMA 1 20128.4250128.430
Southern CTA128.4250128.430
London FIR128.4750128.480
London TMA 1128.4750128.480
London FIR128.8166128.815
London FIR129.0250129.030
London FIR129.0500129.055
London FIR129.0750129.080
London TMA 11 23129.0750129.080
Portsmouth CTA 6 11 12129.0750129.080
London FIR129.2000129.205
Midlands CTA129.2000129.205
London FIR129.2750129.280
London TMA 1 3 4 6 7 9 16 17 18129.2750129.280
London FIR129.3750129.380
Strunble CTA 1 2129.3750129.380
West CTA129.3750129.380
London FIR129.4250129.430
London TMA 1 3 6 16 17 18129.4250129.430
Portsmouth CTA 1 2 4 5 6 7 8 9 10129.4250129.430
Southern CTA129.4250129.430
London FIR129.6000129.605
London TMA 3 7 8129.6000129.605
Clacton CTA1130.9250130.930
Daventry CTA 3 4 5 6 9 12 13 21 22130.9250130.930
London FIR130.9250130.930
London TMA 6 9 10 19130.9250130.930
Midlands CTA130.9250130.930
Southern CTA130.9250130.930
London FIR132.1666132.165
Southern CTA132.1666132.165
London FIR132.6000132.605
Southern CTA132.6000132.605
London FIR132.8416132.840
London FIR132.8583132.860
Upper Airspace CTA132.8583132.860
Berry Head CTA 6 7132.9500132.955
London FIR132.9500132.955
London FIR133.0750133.080
London TMA 1 4 8 10 11 14 20 21 24133.1750133.180
Worthing CTA 3 4 5 7133.1750133.180
London FIR133.5250133.530
Cotswold CTA 17133.6000133.605
Irish Sea CTA 7133.6000133.605
London FIR133.6000133.605
Midlands CTA133.6000133.605
Niton CTA 5 7 8 9 10 11 12133.6000133.605
London FIR133.7000133.705
London FIR133.9416133.940
Southern CTA133.9416133.940
London FIR133.9750133.980
London TMA 1133.9750133.980
London FIR134.1250134.130
London TMA 4134.1250134.130
London TMA 1 11 23134.1250134.130
Portsmouth CTA 12 13 15 16 17 18134.1250134.130
Worthing CTA 1 2134.1250134.130
London FIR134.2500134.255
Upper Airspace CTA134.2500134.255
London FIR134.3916134.390
Midlands CTA134.3916134.390
London FIR134.4416134.440
London TMA 21134.4416134.440
Portsmouth CTA 1 2 3134.4416134.440
Thames Dir134.4500134.455
London FIR134.4583134.460
Berry Head CTA1 CTA2134.7500134.755
Cotswold CTA 1 to 16 + 18134.7500134.755
London FIR134.7500134.755
London TMA 23134.7500134.755
Severn CTA 1 2134.7500134.755
Strumble CTA 2 3 4134.7500134.755
West CTA134.7500134.755
London FIR134.9000134.905
Southern CTA134.9000134.905
Worthing CTA 5134.9000134.905
London FIR135.0500135.055
London TMA 1 14 20 21135.0500135.055
Southern CTA135.0500135.055
Worthing CTA 2 3 4 6 7135.0500135.055
London FIR135.2500135.255
Hebrides UTA135.3250135.330
London TMA 8135.3250135.330
Clacton CTA 5 7 9135.4250135.430
London FIR135.4250135.430
London TMA 7 8135.4250135.430
Southern CTA135.4250135.430
London FIR135.5750135.580
London TMA 1 4 5 8 10 11 14 20 21 23 24135.8000135.805
Portsmouth CTA 12 16135.8000135.805
Southern CTA135.8000135.805
Worthing CTA 7135.8000135.805
London FIR136.2000136.205
Upper Airspace CTA136.2000136.205
London FIR136.2750136.280
London FIR136.5500136.555
London FIR136.6000136.605