At the end of the day I just think you are going about this the wrong way and refusing viewings is doing you no favours.
You've had a good relationship with your LL for 9 years who has allowed you to personalise and make changes. I think we all agree you have to forget the flooring as this was your choice and the newbuild had new carpet albeit thin that the LL did not feel needed changing. In addition, it was your preference to change the patio as the LL thought it was fine and it was your preference to plant up a garden. All perfectly understood.
In between this time you have made good certain repairs that was the responsibility of the LL and she should have done these and you should have waited until she had. But that is water under the bridge.
You have now mentalled checked out of the home, again all perfectly understandable, and want to move on with your new home and partner and baby on the way.
The way I see it, and I have been both a commercial tenant and a private landlord, is that you have a contract which really would be unreasonable to uphold the painting back to cream/neutral after 9 years. Yes I understand fully your point, but your contract says otherwise. But now at the end point you are not going about this the right way refusing viewings etc and riling the Lettings Agent, but more importantly your LL whom you have a good relationship with.
It would make FAR more sense to approach this calmly and rationally and directly approach your LL with an email reinforcing that you have been a model tenant, you have maintained and cared for the property, always paid rent on time etc. You can allude to the fact that you have planted up the garden, paid for flooring and extended the patio that you feel adds benefit to the property. (though do remember these were your choices.)
You can also state that during the 9 years of your tenure the property has not needed to be repainted or recarpeted and legal fees have not been incurred with additional tenants, all saving your LL money.
Therefore, you do not feel it appropriate to have to change the colour scheme back to cream especially since your LL would expect after this period of time that they would require the services of a professional decorator to refresh the property ready for the next tenant.
All of this can be done pleasantly to achieve your desired result. But I can't help but feel that you are listening to some silly advice on here about rip this and that up, take this down etc with people goading you further away from what you want and need to achieve.
Surely with a new house and a new future, getting your deposit back would be enormously helpful. I don't see why you should not if you handle this correctly, politely and appropriately. But being antagonistic normally does not achieve the desired result.
I wish you luck, but do strongly advise you to listen to the more reasoned people on here who are actually giving you sound advice.