London

83 installers

Birmingham

37 installers

Manchester

57 installers

Leeds

28 installers

Liverpool

51 installers

Sheffield

32 installers

Bristol

31 installers

Newcastle

21 installers

Edinburgh

12 installers

Cardiff

22 installers

Belfast

21 installers

Nottingham

22 installers

Hampshire

76 installers

Kent

59 installers

Surrey

58 installers

Essex

66 installers

Yorkshire

106 installers

Glasgow

21 installers

Bath

24 installers

Huddersfield

24 installers

Harrogate

22 installers

Stockton-on-Tees

29 installers

Hartlepool

25 installers

Northamptonshire

51 installers

Bournemouth

23 installers

Portsmouth

29 installers

Brighton and Hove

23 installers

Gloucestershire

55 installers

North Lincolnshire

28 installers

Oxford

20 installers

Reading

17 installers

Milton Keynes

25 installers

Swansea

12 installers

Stoke-on-Trent

31 installers

Aberdeen

21 installers

Southampton

24 installers

York

22 installers

Bradford

23 installers

Wakefield

27 installers

Forest of Dean

35 installers

Truro

12 installers

Sunderland

25 installers

Poole

22 installers

Cornwall

19 installers

Warrington

27 installers

Norwich

24 installers