You've done 20,000 miles in five months? Wow!
People seem to mention the power steering fluid as a common issue to get fixed, but it hasn't been with mine. You didn't mention any pre-heating glow plug warning light, so they're probably ok, but should be covered under warranty if they go before your 12 months is up. Other than that, DPF/EGR issues to watch out for, but you'll know about that if they happen. EGR should be covered under warranty, DPF may not be, it depends.
I personally wouldn't get the cambelt done yet, it's a £700 job, I'd get it done at the next service when you've got 55,000 on the clock for a 4 year old car, sounds about right