So, some photos attached make this obvious - it's based on the WrightBus New Bus for London.  

It's currently on the Lego Idea's site at https://ideas.lego.com/projects/154570/ - I'd be grateful of support to get this to the next stages.  Comments and thoughts always appreciated, too :)

Key features:

• Opening front and centre doors
• An open rear platform for minifigs to jump on and off
• A removable roof to access the top deck to place minifigs inside
• A removable portion top deck to allow access to the bottom deck
• Blank destination panels for customisation within the end pack
• Two staircases for top deck access
• "Push Bell" and grab poles on the lower deck for minifigs to stop the bus

https://flic.kr/s/aHskEj6J68 has some images:

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I thought this looked familiar , I should of put a higher dollar value on it because of the door .

Still I say it's an excellent copy of a modern London bus, Brick On 'doink' ! 

Sorry it took me so long to reply - thanks Lightning Tiger!  I really appreciate all the support I can get, as well as any shares.

I'd also love any other thoughts from people on here :)

I really like that, you've really captured the look of the capital's busses. Great work.

Thank you Callen - if you don't mind supporting it on the Lego Ideas website, I'd be very grateful.

Best wishes

Good looking bus. I always check out the LEGO buses for some reason I like them. I especially like the way the doors open.