bolton wanderer

This is probably a moot point considering that the UK will leave the EU at the end of the year. However, If you remain non-resident then your car can remain in the EU as long as it's street legal in country of registration (as long as this country is within EU). Unfortunately, as a non resident, you cannot remain longer than 90 days. Again, this is now obsolete advice but see...https://lifestylegroup.es/how-long-c...-car-in-spain/

You can still insure your UK registered car in Spain. (Liberty seguros, linea directa) and your car will be on the UK MiD. This will probably change after 31st December 2020.

missile

You can obtain an offer to buy any UK car here > https://www.wewillbuyanycar.es/

They will offer you a low ball price and sell to the trade just like > https://www.webuyanycar.com/

Barriej

I left our UK Reg car behind for my son to sell and purchased here in Spain (in March but had to wait till we arrived in August) so it sat on the dealers lot.

​​​​​​Having driven RHD cars all over Europe when a service engineer. I can tell you that at some point you will drive off on the wrong side of the road.

I spent 3 months last year continuously in Europe driving to jobs in France, Belgium, Holland, Germany and finally down to Barcelona and during that time I reckoned I merrily drove away from the hotels on the uk side of the road at least 8 times (although very early in the morning) with nothing around you sometimes you just switch to auto.
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Second hand cars are more expensive here in Spain but usually are in better condition.
I have a 2007 Citreon C4 and it was about twice the price as in the uk. But much lower km and no rust (although Citreon are more popular here than the uk anyway)

If you are planning on staying here permanently I would say don't bring a RHD.