1. No one wants a nuclear reactor in their back yard
2. Making a safe nuclear reactor takes skilled engineers
3. The only country with those skills in europe are in france (The UK folk have all mostly retired now)
4. Oil companies have been known to fund the likes of Greenpeace and CND to promote fear about nuclear power/weapons
5. Nuclear has a longer ROI than Fossil fuels, but rapidly overtakes the profits when it reaches ROI Investors want to make a quick buck.
6. Investment into safer nuclear reactors has been choked for many of the above reasons
7. Even without reprocessing, nuclear is an order of magnitude less damaging to the environment than Oil/Gas
It would be curious to see if there is a real conspiracy here, namely that green parties are really the creation of fossil fuel companies. Mainly to redirect and block credible environmental movements and replace them with ridiculous fearmongering groups with the goal of making fossil fuels the only option.
Now green is finally in gov again and can only look on the ruins left for them after 16 years of Conservative led power policy.