The Helium Foundation

20 Hatton Wall, London

34-35 Hatton Garden, London

49 Grays Inn Road, London

Clerkenwell Close, London

Great James Street, London

145-157 Saint John Street, London

145-157 Saint John Street, London

145 Saint John Street, London

New Fetter Lane, London

London House, Mecklenburgh Square, London

9A Dallington Street, London

1B Charterhouse Square, London

101 Goswell Road, London

24 Old Gloucester Street, London

68 Great Arthur House, Golden Lane Estate, Barbican, London

8-12 New Bridge Street, London

1 Paternoster Square, London

Bloomsbury Square, London

5 Bloomsbury Square, (on Bloomsbury Way), London

59 Central Street, London

180 Strand, London

49 Carter Lane, London

71-75 Shelton Street, London

71-75 Shelton Street, London

104 Cromer Street, London