No, you just need either two right-hand or two left-hand points. I'm not certain quite how they do it but withe the extra half curves it all works out. Hornby R8074 and R8075 or Peco ST-244 or ST-245 or Bachmann36-874 or 36-875 are the relevant part numbers.
If you can find the space to get larger radii, the Peco Curved double radius turnouts SL-86 and 87 look better and trains much prefer them - I've had some problems with some locos not being happy running over the Hornby/Set-track curved points due to their smaller radius.
Regards,
John W.