I really would be very canny about the whole secheduled cargo operation.
The yield on 750Kg would have to be extremely high, there must be a contract of sorts underpinning this with say a guaranteed amount per day, cock it up one day and the freight will probably head back to which ever integrator its going with at the moment, Paris and Dublin are hardly specialist niches like Emerald used to carve out when they did this type of thing, and the consolodation can be extremely tricky and time consuming and requires a lot of organising. I could see the point if it was for a larger amount of cargo, but for 750kgs it seems hardly worth all the effort.
There is a small market for high value, particularly financial items, but more and more these contracts are swallowed up by the integrators who are hardly going to use this type of service, working closely with the main one for the past 8 year, I can tell you it simply does not fit into their business model.
I'm interested to hear the Nav is no longer the aircraft being used, with limited options on the UK register under 3000kg capacity just what exactly do the propose to operate ?
Like Expressflight, i've been there and got the T-shirt, you could have all the money in China, it wont do you any good unless you have a sound aircraft, sound contracts or spot a nieche in the market to exploit, from what I hear of this operation it would not be something I would invest in personally, but best of luck to them.