I have an update now (sorry, it turned out I had to wait a bit before booking). My travel plans now mean that I'm only after a one-way booking BOM-LHR, which I managed to secure, in C, this morning, making me very happy!

My own little bit of website jiggery-pokery reveals that the website can, in fact, access LHR-BOM award inventory, it just doesn't give you the option to. I didn't find a way to book it online, though. But if you'd like to see it:

• Log into your DC account.
• Go to 'book flights with miles'.
• Choose any city pair (say, LHR-ABZ).
• Choose your months.
• Edit the URL. It will look something like https://www.flybmi.com/bmi/en-gb/fre...rm=LHR&to=ABZ&[...] Change the 'frm=LHR' and 'to=ABZ' to the airports of your choice (say, LHR and BOM).
• See the availability.

Seems to work, at least.

And, FWIW, it's currently wide open from 26th April onwards, in all classes.

So, well, I look forward to trying out The Business, and posting you a trip report on my return!