Feel free to believe whatever you like, personally I prefer it if its rooted in some form of reality.
I'm not a statistician, I just googled things like "farm deaths in the UK" and "deaths on tractors" etc. You get a variety of sources, varying from this one:
[http://www.hse.gov.uk/agriculture/hsagriculture.htm]
with 9 kids 0-16 killed over 6 years (ie an average of 1.5 per annum)
...to this one:
[http://www.hse.gov.uk/agriculture/pdf/childsafetyae.pdf]
saying that 45 children (0-16) and young adults (16-18) died over 10 years, ie c 4.5. And then this source
[http://www.hse.gov.uk/pubns/as10.pdf]
breaks it down to 31 from 0 - 16, and 12 from 16-18 over 10 years, ie c 3.1 kids per annum :
Here is the article saying that about 24% of deaths are from vehicle accidents on farms
www.hse.gov.uk/agriculture/pdf/fatal0809.pdf
Note, by the way, that all teh above are from the HSE.
Here is the article saying 11% of people in the UK are rural
[http://www.nationmaster.com/graph/peo_per_liv_in_rur_are-people-percentage-living-rural-areas]
And here is the article saying that 14 kids 5 - 15 were killed in the UK in 2007 on bicycles
[http://www.bikehub.co.uk/featured-articles/safe-cycling-for-kids-but-not-wrapped-in-cotton-wool/]
And here are child road deaths overall in the UK 2010 (55)
[http://assets.dft.gov.uk/statistics/worksheets/ras30002.xls]
I had started with earlier data (2009) so matched it to 2009 which was 81 deaths, can't find that but here is 2006 (120 deaths)
[http://www.whatcar.com/car-news/child-road-deaths-up-20-/226355]