Sizing a child to a bike

Hello i hope someone can help me,
I am wanting to get my eldest child (hes 5 in march) a decent alloy bike, Islabikes seem to be highly recommend.
However what my issue is, is this:
Isla bikes is around 300 mile away from me in one direction so not really practical for a drive, so using their size chart their 16" says min inside led of 42cm however he has an inside leg of 39cm will the three cm be an issue or would you go with it?
He is a confident rider without stablisers and has been for a year
He has sat on a 16 in Halfords and seems to fit it fine however it was steel and weight about the same as a small car lol.
Any help would be great,
I am wanting to get my eldest child (hes 5 in march) a decent alloy bike, Islabikes seem to be highly recommend.
However what my issue is, is this:
Isla bikes is around 300 mile away from me in one direction so not really practical for a drive, so using their size chart their 16" says min inside led of 42cm however he has an inside leg of 39cm will the three cm be an issue or would you go with it?
He is a confident rider without stablisers and has been for a year
He has sat on a 16 in Halfords and seems to fit it fine however it was steel and weight about the same as a small car lol.
Any help would be great,
David
Bike: Specialized Hard Rock Pro Disc 2010
Bike: Specialized Hard Rock Pro Disc 2010
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http://www.facebook.com/groups/eastbradfordcyclingclub/
http://www.facebook.com/groups/eastbradfordcyclingclub/
I phoned Islabike last week looking for a bike for my son's 3rd birthday.
First call they said that I should really measure my son before they can be sure which bike to go for.
Second phone call yesterday, they asked for his measurements again, which I had done a bit quickly at the weekend. They were about 2cm below their specifications, but my thoughts were that he would quickly grow into it.
The 'salesman' expressed the view that they didn't want to sell a bike that didn't fit and that perhaps I might want to check the measurements as the inside leg measurements in the chart were what they considered the absolute minimum for riding safely.
He also said that as delivery was currently less than a week, I had plenty of time to remeasure and still get the bike in time for his b'day.
I took the view that 'he'll grow into it'. I also didn't want the delay of having to remeasure him (and possibly missing b'day), so I persuaded the salesman that he should sell it to me.
I have to admit you have to respect a company that is committed to ensuring that the bike fits even if it could cost them a sale. I guess they are right though. It could be quite off putting for a littl'un if their first experience of their new bike is hindered by not being able to put their feet down safely.
My plan is now to get it out of the box and then check him against it. It might need to wait until the better weather...
I've also just recieved notice that the bike should be with me tomorrow - not bad seing as I only ordered it yesterday.
Basically I am stuck with the chart as the cnoc 16" says min inside leg 42cm and height 104cm and the Beinn 20" small says 46cm inside leg and 110cm height. my son's correct measurements are, inside leg 43cm and height 109cm
I am unable to travel to see them as they 300 mile away in one direction so you can understand my situation I need to be certain he can ride it and not be disapointed on his birthday.
any other info that anyone may have please add it.
does anyone live close to Hull East yorks with a Beinn 20 small bike?
Bike: Specialized Hard Rock Pro Disc 2010
6 months he had both feet flat on the floor so the saddle has gone up. They grow SO FAST.
If you lad is 3cm short on the leg for the Benin 20 then I fear it would be too big for him if my experience with the Cnoc is anything to go by.
If it doesn't move and should, use the WD40.
If it shouldn't move and does, use the tape.