Are you talking about yellowing at the top of the plant? The new growth at the top doesn't look yellow to me. It looks exactly like new growth should look.
How far away is the light from the top of the canopy?
What is your watering technique? Fast or slow?
Have you started using tap water?..that'll be fine in the UK.
What do you mean when you say you haven't got the best drainage?
Can you post some more pics of the full plant?
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