Responding to the Green Paper, my experience is:
It can be hard to figure out how to even respond, sometimes the consultation paper itself is hard to find. Then they don't make it obvious or easy to even find the online survey (provided for collecting replies) or the address to post your letter to. Keep looking hard.
Typically there is an online survey made up of set questions about specific sections of the paper: these questions may not allow you to raise any points (for or against) that matter to you. The questions may (all) be very mock-innocent "How much do you agree that education needs to be improved", and "Do you agree that it's important to give bright children from poor children access to the best possible education." Chances for you to raise your own ideas, using the online survey, may be minimal.
I always swear at this point that the whole thing is a stitch up (witness most recent consultation about future of the BBC). So writing to your MP using your own bullet points may be the highest impact action. You could write a full letter to consultation panel, too, but I am convinced these are dealt with crudely:
Either sorted into 2 simple categories of for/anti proposed changes, OR
...used to go thru the online form & they pretend to answer all those vague questions from the info in your letter.