Replacing central heating clock/timer

[YorkieJohn]

At the moment we have a Horstmann 425 Coronet with the electrical supply running up from a double socket, we are replacing it with a Horstmann Channel Plus H17XL series 2 plug in direct replacement. Can I do a straight swap with the wiring as it is or would I need to put a fused connection unit in ?

[gasman]

It should be fed by its own independant 3A switched fused spur not wired direct into the plug socket ring main.