Apologies in advance... once I'd started thinking about this, the ideas just kept rattling around inside my head so I gave in and decided to get on and do the drawings!
This is definitely NOT the official UKBF insignia and badges; this is what *I* would have suggested. I've tried to stick to their scheme as much as possible but I wanted to tidy it up a little (!).
The organisation's corporate badge and the cap badges are entirely my own concotions, although I have incorporated the historical Tudor portcullis badge, previously used by the former HM Customs & Excise. I think the portcullis is an appropriate emblem as it very much suggests the role of the Force as the guardians of entry into the country, although I suspect the portcullis was deliberately NOT used as it might also be thought to look a little like the UK is trying to keep people out, which could be seen as unfriendly. Given the public mood in recent elections however... (!).
Anyway, in keeping with the intended role as a Home Office border police / enforcement service, I have stuck to dark blue uniforms with silver badges and insignia.
This fist pic is the rank scheme and various badges. The DG and directors wear standard UK police-pattern cap embelishments and gorget patches (essentially army-pattern but in silver), as worn by Chief Constables and Deputy / Assistant Chief Constables.
Deputy and assistant directors have one band of plain raised embroidery and no gorgets, matching police Superintendents and Chief Superinitendents. All other caps have plain patent peaks.
The second pic is the formal uniform -- which probably wouldn't be worn all that much in practice. I guess the day-to-day working uniform would remain dark blue cargo/combat-style trousers with dark blue shirts and the epaulettes shown above.

The final pic is a possible alternative version; it could be for all staff but I originally intended it it to be a specific variant for the permanent crews of HM Cutters. The rank lace (and the rest of the uniforms) is pretty much Royal Navy pattern but with silver instead of gold. Note the different cap badge to the other uniformed officers and the use of RN-pattern oak leaves on the peak. I guess the four-stripe rank would be the overall manager of maritime operations and the three-stripe rank would probably be the CO/Master of each cutter, with other roles ranked as appropriate. All other uniformed staff seconded to the cutters for operational / enforcement duties (as against maritime operational roles) would continue to wear the standard police-style uniforms.

The uniform on the far left in the last pic is a bit of a visual joke: the current Director-General was formerly a Royal Navy Vice-Admiral (and Second Sea Lord), so I couldn't resist including this, although I don't suppose there'd be much need for the DG to have this version of the uniform as well...!
