Just an update really
I finally sold the domain for £11,500 app $18,500.
I had it appraised but it came back to be only worth $4200 max
I would advise people that while some appraisal sites give a guide, don't take the figure as fact you might overvalue or undervalue the domain. Let common sense prevail, the bottom line is how much is someone is willing to pay for the domain.