I may just be thinking too much, but i'm sure there is a weird feeling when i'm in reverse.

Feels like something is off balance in the gearbox area?! also now i'm getting paranoid and sure every so often i hear a small grind noise... and no it's not me crunching the gears...

This sound like the begining of an issue to anyone or sounds like my mind is playing tricks?

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New from the UK and wanting a NICE little British car!

Check your engine steadies.
I know the feeling... I have driven plenty of Minis that have the same shuddering kind of sensation.
I think its excess engine movement that contributes to it... Maybe clutch problems too?

Who knows