1) If you visit the EDP site, its official policy is summed up as "Our objective is the creation of an English Parliament within the United Kingdom."
(This is the window I found amongst all the mish mash:
http://www.englishdemocrats.org.uk/general.php )
Therefore, I am not sure what 'break up' you mean in 1) This policy would not seem to require dismantling the UK. On the other hand, to the extent that it is based on the status quo, it does not preclude it.
Hazarding an opinion, the more of the EDP's members happy to retain the UK (or perhaps a re-negotiated one), the less likely it is to change that policy into one of demanding independence.
For the EDP's aim to be realised, the composition of the Commons must be radically changed, and most of its unrepresentative Members removed. Therefore, the UK is unlikely to be significantly more susceptible to the 'rape' you allude to than now. The most urgent consideration must be security, which transcends even the "Fighting over the dwindling amount of power our people have . . " I don't understand the reference to 20% - 80%, save to say, the EDP would be primarily concerned with the 83% of UK citizens living in England, but not exclusively - that would be irresponsible!
2) This is referred to above ie "For the EDP's aim to be realised, the composition of the Commons must be radically changed, etc ". Concomitant with that will be a Commons replete with anti-EU Members. Consequently, the EDP's other principal policy of actually conducting a referendum on the question of continued EU membership (which includes the option of leaving) could be effected. (
http://www.englishdemocrats.org.uk/eurounion.php )
Does this take things further for you?