Yes I've taken my Morgan's to a local independent for the last 19 years for MOT but I do my own servicing etc.
It has never impacted on the resale value not having dealer stamps and I know it's all been done.
How do you know, you’ve not tried to sell your plus 8 yet 😉
and have had good offers for this one too and it's not even for sale so it's not a concern for me 
...