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Your poor old plant is under stress - the south-facing windowsill bit is OK, but the warmth and dryness of central heating coupled with the inevitably low light level of the windowsill means the plant is unbalanced.
If you can move the plant to an equally bright, but cooler, frost-free unheated area and go easy on the water. This will get the plant back into balance. There is little need to feed in winter when the plant is growing poorly.
Also check the roots by tipping the plant out of the pot - if rotted, dark and dead, repot into a smaller pot with fresh multipurpose compost. If sound, leave re-potting until April. Repotting will set the plant up well for the summer.
In summer it will do much better if you place it outdoors and feed every fortnight with citrus or other high nitrogen feed.
On the plus side there appears to be little leaf loss which is a very good sign. A certain amount of yellowing is unsurprising given the circumstances - it will receover when you can improve growing conditions.
Boggy
Beware the bat-eared bogweevil
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