Triggles, sometimes the award is made for MRC when they can see that the person needs 'frequent attention throughout the day' OR 'attention at night and some attention in the day'.
So, either they have got the impression that your DS is night-waking but doesn't need your attention (ie. that he is awake but quite happily led in bed singing to himself, or playing with toys, etc.) or, they have got the impression that you do give him lots of attention at night, but during the day he only needs a little help.
What you need to do now is to look at the reasons they gave for issuing the award. That will give you a first clue.
Then, go through the claim form (you did keep a copy, right?) and look at it critically. Did you write explicitly in a similar format to this:
How often your DS wakes
What you have to do
Why you have to do it
What would happen if you didn't do it
How it is different for a 'typical' child of his age.
With a child who is variable, it is useful to do sections:
On a good night......
On an average night.....
On a worse night.....
On the worst nights......
Also, it is important to know the benchmark for night criteria:
Up once for more than 20 minutes to deal with personal care needs.
Up several shorter times per night to deal with personal care needs.
That, generally speaking, that is needed for 5/7 days or more.
HOWEVER, there is also scope to claim that a child needs your supervision whenever they are awake, so although they may not wake, they need constant watching if and when they do wake to prevent significant harm or injury to self or others. The harm does not have to be certain, but has to be a reasonably significant risk.
Now, what you have to do is go through the copy of your claim form, and highlight any information you supplied about night needs. Also, look at the evidence you sent in. Try and work out whether you supplied enough evidence, or whether perhaps you weren't explicit enough. It is easy, when you live this stuff every day, to assume some knowledge of the Decision Makers, and to be honest, you don't know if they even have experience of 'normal' night waking of infants, let alone the night waking of a child with SN.
Then, you have two options. You write asking for a reconsideration because you feel that they didn't look at the evidence correctly, and you bullet point every detail that they have missed, referencing supporting documents, etc. This gives them the opportunity to see that they didn't make the right decision based on the evidence supplied.
OR
You write, asking for reconsideration, saying 'I,'m not sure I quite explained myself, because I believe my child meets the criteria for High Rate Care.' Then you go on to explain further his day and night needs.
It is important, in this case, to not just focus on night needs, because for a HRC award, they have to see that he needs 'frequent attention throughout the day' and attention at night. A person who only needs attention at night, but is independent by day, would still only get MRC.
It is really very important to make sure they know that he does not have a Statement, but his needs are so great that he is being given 30 hours on SA+ while they wait, because he can't be left unattended.
HTH