Not the most expensive 070 number group!
But a lot more expensive than 0870 numbers.
070921 numbers are charged (from a BT landline) at 37½p/minute peak, 25p/minute evenings and 12½p/minute weekends.
Interesting that the 020 7691 7074 number is shown in
THIS DOCUMENT as 'Voicemal', not fax.
Anyway, from 192.com:
TEFL PROFESSIONAL NETWORK LTD
72 PENTYLA BAGLAN ROAD
PORT TALBOT
WEST GLAMORGAN
SA12 8AD
01639 898 611