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Kumquat

We got one from Lidl earlier this year and it's been in our conservatory ever since. It was doing well until the hot spell last month which burned the leaves off. It now looks a bit sorry for itself:

Anyone any ideas of how to revive the plant? All we can think of is to leave it outside but would that do more harm than good?
At about 750 feet on the western edge of The Pennines. Clay soil.
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Give it a good drink by duning the pot in a bucket of rainwater, if possible, until no further air bubbles appear then let it drain. Feed it with a high nitrogen feed for foliar plants up until late September. If you only have tap water, use a feed for ericaceous plants that contians chelated iron.
For autumn through to mid spring, switch to a feed one specially formulated for citrus plants and containing higher P and K ratios plus some essential minerals such as magnesium.