I'll try to take your points of complaint one at a time, with brutal honesty. Please please don't think anything of the below is intended to be negative towards you - you've had a horrific experience and you deserve the best service possible, and justice.
1. Police not attending the scene at the time.
Unfortunately this is common at the moment. The police numbers have been beyond decimated. Our shift is running at less than half the numbers it used to. Daily we hear calls where we can't deploy units. Your incident would have likely not been graded as needing an immediate response due to the fact that the offender had gone. It probably would have been graded as requiring a response time above which you got, but failed response times are common nowadays.
Solution? Write to your MP and tell them to lobby for more police.
2. Police not having any intention of attending you.
They should have. Indeed, they should have called to apologize for missing a response time and let you know when they could get to you. If they weren't even going to visit, the solution has to be to make a complaint to your local station to the inspector.
3. Attending registered keepers address 34 hours after event.
You will doubtless be shocked, but this is actually a good response time in the current climate. If what you said happened to me and I reported it, I wouldn't have been surprised if the investigating officer had simply sent a formal notice requiring the drivers details to the registered address, which gives them 28 days to reply.
4. Police making no effort to obtain CCTV or witnesses.
Are you sure? Is there some CCTV footage that you know exists, that you know they haven't obtained? Are there witnesses that you know they haven't spoken to? If the answer to those is "yes" I would suggest ringing your investigating officer and asking the direct question of when they will do it. If you don't know for sure, can you clarify how they haven't done the above?
5. Not listed as wanted on Interpol.
I have been an officer for over ten years, and I wouldn't have a clue how to check that! PNC is a different matter, that's easy to check and easy for him to be placed as wanted on it. Is he wanted for your offence or something else?
6. No local appeals for witnesses
I'm presuming you mean newspaper appeals, or those 'There was a collision here' boards. This normally isn't done unless it's serious injury or death. However your local paper may like to run your side of the story which could have the same effect?
To answer you in summary, there are some things you describe that I wouldn't be happy with, and I would complain (police not intending to follow it up), there are some parts that I would question (CCTV and witness issue) and some parts that I personally would be happy with (the 34 hour visit to registered keeper).
The problem with every investigation is that you need to understand that the officer investigating your case probably has another 15 cases of an equivalent level running at the same time. On top of this they likely get given daily tasks by supervision and their radio. The problems are caused by simply not having enough officers to deal with the workload, which can only be corrected by the government. However, the complaints land wholly at the feet of the police, increasing bad feeling from the public and making it even easier for the government to cut numbers further!