Really like #164 and your thoughts behind it.
Could you see what the globe would look like as a pale blue colour and remove the little white circle?
Could you also try a few things with the lettering please?
1) Layer 'The Biodiversity Consultancy' ontop of each other as 3 tiers so that 'TBC' could work vertically?
Having said this, I quite like the way the top and bottom line of the wording match, very neat. So... this would be purely experimental.
3) Then, could you produce a logo with just 'TBC' (as opposed to the full name of the company). Please try this both vertically and horizontally.
We really like this design, which is why we're giving you more to do!
Many thanks