Northumbria Gas Ltd

11 Longley Lane, Spondon, Derby, DE21 7AT

Unit 4 Blurton Business Park, Barlaston Road, Nationwide, ST3 3LD

Mount House, Rooksley, Milton Keynes, MK1 1SF

Unit 4, Blurton Business Park, Barlaston Road, Stoke on Trent, ST3 3LD

Unit 7 Genesis Park, Sheffield Road, S60 1DX

2 Queenslie Court, Summerlee Street, Glasgow, G33 4DB

Clarendon Road, Darlington, DL1 3HL

17 Fieldside Close, Scarborough, YO11 3EB

282 Leigh Rd, Southend-on-sea, Leigh-On-Sea, SS9 1BW

83 Kenton Lane, Newcastle upon Tyne, NE3 3BS