Hi Rushi!!!!
First step : you have to see wether the service is provided in india or outside india.
second step: if service is provided in india than TDS will be applicable @ 30% on fees payable as technicale service.
Third step: you have to check out wether DTAA is applicable to U.K.
If your ans is yes than choose higher of the following rate
1- Rate of TDS on Technicale fees applicable in case of foriegn remittance @ 30%
2- Rate applicable under DTAA (i dnt know the exact rate under DTAA for U.K)
PAN card number is irrelavent in this case as on nonavailablility of PAN card Number we deduct TDS @ 20% but here in this case TDS rate its self is 30% i.e. higher than 20%.
You can check out it with taxman also.
I am replying you this after discussing with my Seniour.