A UK Info search for Plusnet gave the postcode of S26 1HF.
A postcode search brought up PC WHOLESALE (UK) LTD, also sharing the 0114 2200000
No other seach gave anything better for pc wholesale.
A 192 for Plusnet gives
PLUSNET ASP LTD TECHNOLOGY BUILDINGS INSIGHT CAMPUS TERRY STREET SHEFFIELD S9 2BU
0114 220 0059
Their fax, wherever listed, ends in 0055. So it looks like they own the sequence between 00 & 59.
If you're using a free service to dial out, eg voipstunt, then it won't hurt to try a few of the in between numbers.
Had another go, this time googling plusnet + 0114
http://www.plus.net/press/press_releases/12042006.shtml?pn_session=3b791a9b457a9...Brian Trevaskiss
Marketing Manager
PlusNet PLC.
btrevaskiss@plus.net
Tel.
0114 296 5181http://www.plus.net/investors/press_releases/financial_investor_press_releases/0...Enquiries:
PlusNet plc - Tel:
0114 220 0012Lee Strafford, Chief Executive
Ashok Makanji, Finance Director
http://www.e-consultancy.com/newsfeatures/156005/plusnet-throws-down-broadband-g...Peter Jackson,
Marketing and Communications Coordinator
pressroom@plus.net.uk
Direct Line: 0114 220 0051
Marco Potesta
Marketing Director,
Direct Line: 0114 220 0059
Neil Comer, Commercial Director
http://webfund5.financialexpress.net/ir/NewsArticle.asp?ArticleID=20051014085816...(This article mentions that Plusnet has teamed with Eaynet, they're learning from Stelios)
PlusNet Plc
Roy Robinson, Press Office Tel: 0114 22 000 72
You could try Metronet which is part of the plusnet group. Tel: 0114 296 5185
Also based in Terry St.
Force9 also share the same sequence of numbers, and are part of the group.
Best of luck.