I just wanted to check something.

I had some trouble getting all the plugs out from our Peugeot 306 1.4
(1998) due to the position of the injectors/air inlet (big plastic thing
which air filter goes into and curves down into the the cylinder, next
to the plugs.  I think I got 3 out, but couldn't get all 4 out.

Anyway, due to that being in the way, and not knowing how to remove it
properly, I asked a garage to change the plugs when they were doing
something else.  I asked for them back so I could see their state.

This was a while ago, and since stopped using that garage due to being
unhappy with their work.  I'm preparing to change the plugs again
(myself this time hopefully) and went to my local factors who supplied
me with 4x NGK BKR6EZ.  This is a single electrode plug, and is listed
as the correct plug for this model on NGK's website.

The issue is though, I'm now looking at the old plugs and noticed that
they're double electrode ones - specifically NGK BKR5EK.  Whilst they
seem the same size, I'm a bit surprised to find double electrode plugs
were used before - especially when NGK don't recommend them for this
engine.  The previous service would have been done by Peugeot
themselves, so the plugs are either:

1.) Fitted by Peugeot themselves, even though they're not the
recommended ones
2.) Changed by the garage, but the wrong ones were returned to me
3.) Not changed by the garage, and someone else's plugs returned me

So, which seems the most likely?  Are these plugs actually okay (ie.
would Peugeot have fitted them), or was it 2.) or 3.) then?

Finally - any suggestions how to get the plugs out - I'm wondering
whether an articulated plug remover would be useful.  Before I used a
socket set with a plug socket on it - but I think with an extender,
hence not being able to get into the gap between head and air inlet stuff.

Thanks

David