I am not a lawyer so i could be completely off track here. However for what it's worth I understand the desire to get a straight answer about this question and (i think) I see the difficulties a solicitor must have in giving an accurate answer.
I believe the standard answer is that the wishes and feelings of the child will be listened to by the court but in the light of their age and understanding. At 10 a child's views would carry some weight but would not necessarily be definitive. Other aspects are also taken into account as listed in the welfare checklist in the childrens act.
My conclusion when I was in a similar position about cafcass reports was that my solicitor simply couldn't predict which way it would go.
After some thought, further conversations with my solicitor and unproductive internet searching I concluded:
It must very much depend on the issue: ie I think a court would be less likely to allow a 10 year old to completely cut contact or to choose contact where there were risk of significant harm. I also don't think they would allow them to choose something completely impractical or dictate very precise contact patterns at that age. Court orders have to workable. I imagine they may get some weight with regard to the rough amount of time but less so if it is too far away from the status quo or vastly different from a standard sort of pattern ie seeing a nrp only once a month or most days of the week (in the absence of any other major issues). I think.
I think it comes down to cafcass asking them questions about what their interests are, what they like doing at mums or dads, what they like and dislike about current arrangements and roughly what they think about more or less contact. I imagine if they express strong views that are well articulated as to the reasons then that carries more weight than a vague answer with lots of shrugs and don't knows. I imagine a cafcass officer might ask a child what would make contact work better or push a bit more at the reasons a child has if they are asking something a bit more unusual than standard eow and one day a week.
I was once told the court in my area was conservative with regard to contact orders and they tended to not go for shared care arrangements so it must depend on the individual court/judge/cafcass officer too.
Solicitors must have clients who are very sure their child is: very mature/completely knows their own mind/insecure/fooled by the other parent (delete as you wish) but actually is inaccurate about what their child will say to someone independent.
On internet forums you'll just get lots of people whose views are coloured by their own experiences and it's even harder to get enough detail to give an accurate guess.
It's now no longer an issue in my case and I'm sorry you're still in this position op - I think it does improve with time.
We ended up sorting a lot out with mediation so thankfully I never had to put my theories to the test. I would be interested to know if any solicitors think my thoughts are accurate or wildly out though!