Boost switch to install into Central Heating control

[planenut]

Hi people. I have had to come back to this old chestnut again, due to people in a house I have, switching the central heating off timer on to "on" and leaving it.
I have looked at the Horstmann Electrisaver E15 which provides the ability to "boost" for either 15,30 or 60 minutes.
I wish to instal one into the wiring of my Halstead Finest Gold central heating control.
I think that I could introduce the "switch" in the wires which run from the back of the trip switch.
Any comments would be appreciated.
I have ended up with this choice as Halstead could offer no alternative.

 

[Adam_151]

What central heating programer do you have?, if you havn't already bought the boost timer then it probably going to be much better to swap the programmer for one that has a +1 hour function

What sort of layout does the heating system have? C plan, S plan, Y plan, etc?

 

[planenut]

Thanks Adam151; the programmer is inbuilt in the Halstead finest gold control panel (a combination boiler) in the form of a time clock with an override switch.
The wiring diagram shows four connections into the clock with the two reds being "switched".
Due to these tenants continually leaving the heating on, I want to put a one hour boost switch only, on a nearby wall, then lock the front panel in place, thereby making it inaccessible to alteration.
I hope that helps anybody who's been able to put any thought into this question.