Hello, thank you for ranking. I will try to integrate the image of a Duke ... but maybe that image is strong because remain simple. We'll try. The symbol of the King (English) is the Lion ... there's no information about Dukes.
Are you able to come up with different examples of a emblem logo. Incorporating the crest and text you have created so far? Possibly using the white red and greyscale combination or red, blue and grey combo?
Use your imagination!
Maybe coming up with completely different angles. More modern and abstract possibly?
Are you able to remove the UK in the emblem and put the man on the horse in the middle?
Keep the crown on top as well as the lions but also try and add some more modern aspects of design to the emblem. Like a taxi from england mirrored on both sides or a buckingham palace guard etc.