If you are worried about connecting to 10mm, just have a look inside the ballofix valves that come with the heater, about 8mm bore, so i don't think you will have too much to worry about
just fitted a smith heater to my kitchen. Is a good piece of kit, put it on a seperate thermostat so I could control the room temperature in the kitchen. Would not worry much about pipe sizes (providing you are not trying to supply loads of big radiators via the one 10mm microbore branch) , balancing rads and adjusting bypass on system if fitted is how you ensure good flow to plinth heater just as if you were fiting any extra radiator. I got the stainless cover for it, here is a few pics.l
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