What is the real value of a good condition 2008 T-spirit.

I have had a few people asking to buy my Prius. It has 178k miles and still gets 53mpg (UK gallons). When I look at Autotrader I can see similar being offered for anything from £2k to £4.5k. We buy any car offered £1.4k. I am in London so its a positive factor that it meets the Ultra low Emission Zone (ULEZ) requirements. It has a new Toyota Cat and a Toyota Cat lok fitted - which vibrates occasionally. It was serviced and MOT tested in December by an AA recommended garage - no problems reported. I am tempted to get a Rav4 or CH-R but on the other hand - I could just drive this into the ground as it does work perfectly well. Assuming I decide to sell, what is a reasonable price to ask. I guess the downside is that its colour is bronze and according to my son in law that makes it an old mans car - but thats what I am! I am the second owner and bought it with 12k miles on it round about 2012

 

There was a a guide but I haven't seen one in a long time -