Its this one now top of the list http://www.icage.co.uk/Probably not - it looks like there is a terminal block that's slightly remote from the lamp housing. but you must follow whatever the MI (Manufacturer's Instructions) say.Do I have to use heat resistant flex (will be led lamps)
That fact that you are using LED lamps doesn't matter - because you cannot guarantee that no-one will fit a halogen bulb which will run considerably hotter.
So one says use separate junction box and then heat resist flex and the other says ok to use existing twin and earth standard flat loop in and out