hi omidknight,
Regarding the rad trims, I don't think it matters. They will heat up with the rest of the mass of metal and act as part of the rad. As for the drain cock, I assume you are talking about it being part of the lockshield valve. In this type of valve of UK origin, the drain is usually operated by a small square headed nut protruding from the horizontal end of the valve. Many Continental origin lockshields have the drain facility incorporated into the lockshield design itself,- neat, but does require a special "key" to operate it. It would be unusual for the lockshield to operate the drain off directly.

mike

The best competition for discreteheat is climaboard, sold here:
http://www.radgone.co.uk/why.htm

I looked hard at both. For high heat requirements climaboard have the edge (shouldn't affect too many on this forum!), for cost too (at least in Italy - and remember you need less climaboard so you have to size, then cost, in order to compare), and they will do RAL colours or even your own texture/pattern from a picture (to match your wood floor for example), whereas discretheat just do the 8 or so colours but discretheat are much, much more attractive as they started with the aim of imitating standard skirting boards and so the profiles are identical. Also note that climaboard works by creating air currents through their board, whereas discretheat is simply a long thin radiator. I have found discrete heat to have suberb customer service. In the end thopugh, both solutions were too expensive for me so, sadly, it is back to radiators!

Hope this helps.!