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Cheers all, problem solved, especially if I use a sealant. 

Thanks Lurch, and everyone, and sorry for any confusion. I knew the plastic fittings were ok internally, they just seemed a bit flimsy for outside use, and vulnerable to water. However if they are acceptable so be it. 

I was unsure of the connection between the conduit and the box, but blink's solution seems workable, ie a brass trs gland. Does this connect to the conduit and then to the box? My main concern was to maintain ip, I do have the option of side entry to minimise moisture ingress. 

Hi, A simple question this: I need to feed 4mmsq twin and earth cacle into an outside junction box. The box has 20mm knockouts, I am coming in from the top. Which is the best way to do this, making sure I maintain the IP rating? The t+e is in plastic conduit. 

There are 10 kinds of people in this world.  Those who understand binary, and those who don't. 

Thanks all, for the advice. 

Yes, (I actually meant radial circuit, not ring!). Can I just use the female adaptor with a metal box? I need to feed the conduit all the way into the 20mm knockout, but wondered whether the standard adaptor and bush was sufficient.

Hi, A simple question, I suspect. I am running a ring circuit in a shed to a metal consumer unit. The t&e is going through 20mm plastic conduit to the unit, what kind of termination should I use? Is there a gland that takes the conduit into a 20mm knockout in the CU. Thanks.