...and one more, if anyone can help. Although it's been heavily customised - the "E" has been tweaked, and the letters have obviously been tightly spaced to form a single shape etc. - this looks to have been based on a sans serif face, but I can't place it. Does anyone have any ideas what it might have been originally?

Thanks!

Neue Frutiger Condensed Heavy  Suggested by donshottype 
Inconsolata Bold  Suggested by donshottype 

The most distinctive letter is the _G_ -- the _E_ is a simple modification of many fonts.
The bottom half of the _G_ is similar to to fonts such as Neue Frutiger Condensed Heavy for the white fill and Neue Frutiger Condensed Black for the outline. Condense them further and combine with a segment from _O_ for the top and you can produce something similar.
Don

Inconsolata Bold has a much closer _G_



It could be used to recreate the logo if compressed horizontally, thickened and with minor modification of the upper terminal
Don

Hi, Don

Thanks for the tips, and sorry for the late reply. I'll have a look at the suggested fonts and see what I can come up with based on your suggestions. Many thanks! :-)