>>> So what might be a good value for a pull-down resistor then?
>>>
>>> (4.5V supply, 74HCxx ICs.)
>>
>> A very common choice is 10 kOhm.
>
> OK. That should only be a few pence...
Unless you are connecting a switch to the input, I don't see why you'd need
a pull-down resistor, just connect it directly to ground.
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