Wooden door frame sill come loose

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Recently my front door has become increasingly hard to open and close. It was catching the stormguard attached to the sill.

The wooden door was fitted at the same time as the sill 2 years ago and fitted fine. At first I thought the bad weather had caused the wood to swell (Is this possible? It does need staining) closing the gap between the door and the stormguard. This has gone on for a month now and I was worried the door would be damaged due to the force required to open and close it so I removed the stormguard to investigate.

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Permanantly removing the stormguard is not an option as there is about 1cm of daylight under the door when the stormguard is removed.

The sill that the stormguard is attached to has come loose from 2 of its 3 fixings. I have attached photos.

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This shows one of the fixings. It appears that 2 pads were laid on the course of bricks and the sill was attached to the pads using some sort of adhesive.

Is this a normal construction method?

My options are to reattach the sill to the pads using adhesive and hope that this will give me the 2-3mm needed for the door to clear the stormguard. What adhesive would I use?

Or remove the sill and shave a few mm off it using a wood-planer before reattaching it. Either way, I'll give it a sand and apply a few coats of wood-stain to it.

Advice please?
 
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At first I thought the bad weather had caused the wood to swell (Is this possible?
This is a common problem if the bottom edge of the door is not treated, really should plane the door rather than the cill
 
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At first I thought the bad weather had caused the wood to swell (Is this possible?
This is a common problem if the bottom edge of the door is not treated, really should plane the door rather than the cill
Good point. The door is heavy so I did want to avoid taking it off its hinges but it would solve the issue.

Any advice on how to reattach the threshold?
 
Can you take another photo further away, the others is a bit too close to see the overall picture of what is happening
 
Any advice on how to reattach the threshold?
I'm a little thick today :)

Do you mean the threshold which you meant the sill or the stormguard threshold or the door threshold?
I'm actually not sure of the correct terminology but I'm referring to the piece of hardwood to which the stormguard is screwed.
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It appears to have previously been attached to some 'spacers' using adhesive. The spacers are attached to bricks.

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The above photo shows the view when I lift up the threshold/sill and the 'spacers' and bricks beneath it.
 
Okay that's the sill, if it not loose or bouncing then backfill with mortar, should have a membrane under the sill to protect the timber, if it's loose then I normally use plastic packing rather then treated timber in 3 section then fill the rest with mortar although some use foam instead of mortar then plane the bottom of the door
 

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