Swapping Drayton 601 SCR for Honeywell HC60NG

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My 4 yo Drayton has packed up (have checked the battery/terminals and communication) and have bought a Honeywell as a replacement (with corresponding RF Stat). All I need to do now is wire in the new receiver, but am having difficulties.

The Drayton was wired as follows:

N - Blue
L - Brown
1- Black
2 - unused
3 - Grey

The terminals on the Honeywell are (left to right)

N
L
L
EMPTY
A
B
C
D
E

As far as I can ascertain, the Honeywell first two Honeywell terminals should take the Blue and Brown wires respectively.

My question is - what terminals do I connect the Black and Grey to.

Early responses much appreciated as it is FREEZING.
BTW, my boiler is a Worcester Bosch Greenstar (non combi)

Many thanks
 
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Drayton:

N - Blue (Neutral)
L - Brown (Live)
1- Black (Common)
2 - unused
3 - Grey (Call for heat)

Honeywell

N Blue (Neutral)
L Brown (Live)
L
EMPTY
A Black (Common)
B Grey (Call for heat)
C
D
E
 
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