So I have not VT’d a car myself, but i do work (very) closely with this process…
So you will not have any black mark placed against you if you VT a vehicle. Its a consumer right and one which is actively used nowadays (ah PCP’s the saviour and now the cancer of the motortrade) I would say however that if you utilised the same lender and VT several vehicles they may take a dim view. But its highly unlikely they will decline you for utilisation of your right as a consumer.
In terms of vehicle condition, your finance company would look for you to return the car in line with BVRLA fair wear and tear guidelines: https://www.bvrla.co.uk/advice/guidance/returning-your-leased-vehicle
They will have a cost matrix setup for damage recharge so if the car is a nail be prepared as some will pursue you for recharge….others wont.