I read an article recently which said that the government is to spend £200m on scrapping the Nimrods. I find it difficult to believe there is NO value in these aircraft or is someone somewhere making a fortune out of this.
Being realistic about this the only countries that would have any interest in buying these antiquated airframes are exactly the countries that you wouldn't want to be selling them to in the first place. Nobody else would be interested.
That coupled with the fact that they're all bespoke, handbuilt and hardly any of the measurements are consistent between aircraft means scrapping is reallistically the only sensible option for them.