Compare the market have automatically estimated the value if my car ( the market value) after I put in just the registration. It doesn't take in to account the condition/mileage etc
Should I manually increase the value?
Obviously if I do my premium will be higher but if the worse was to happen and my car was written off would I still only get the "market value" ie their estimate and not what I paid for it?
You can put in what you like. Its only an estimate which will be more accurate if it is stolen or written off. It only matters if your car is something special which makes it more valuable, in which case you should tell the insurer. If its been "pimped up" you may be charged a higher premium as the insurers think you are not a standard driver.