Democratic reform is evolutionary, it's actually very difficult to envisage a future system as each change brings up further issues which in turn need to be addressed in a new, future context. What you have to do is to reform with the aim of reducing the worst aspects of what we have and move forwards cautiously. It requires a level of detachment and 'objectivity' which is sadly lacking in British party politics.
Anyway, since you asked, here goes.
Democratise the House of Commons - abolish the Whip system.
Democratise the Lords - abolish hereditary Peerage.
Abolish first past the post - introduce PR
Abolish over 1,000 non-democratic Quangos which currently have delegated parliamentary powers.
Abolish lobbying - the whole idea is corrupt and anti-democratic.
Introduce Swiss style "feedback" voting. i.e. what parliament decides must be resubmitted locally before becoming law.
Allow MPs time to actually scrutinise, discuss and absorb what they are voting for in Bills - It's widely known that the majority never even manage to read what they vote for!!!
Finance the whole of Parliament from the public purse - avoids corrupt vested interests.
Prohibit MPs from holding positions in the private sector - avoids corrupt vested interests.
Streamline referendum system for frequent referrals to the voter - as in going to war or major national decisions.
That should at least get us going in a better direction.
Parliament needs to be seen as a responsible, corruption-free institution. Train individuals for the important role they will play in their country's government. Respect the voters and win back respect.
One can but dream
Regards, Mike