I went for this RX 7800 XT.
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Its a great card, does anything 1440P and its 4K capable, £20 over your £450 budget but at Tetras said the 4060 Ti 16 GB is a much slower card, the performance you get with DLSS quality mode is what you get native with the 7800 XT, if not more, if you're gaming at 1440P the 8GB version is useless.
If i had to do it now i would stretch my budget to the 7900 GRE.
Order Sapphire Radeon RX 7900 GRE Gaming 16GB GDDR6 PCI-Express Graphics Card now online and benefit from fast delivery.
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The alternative if you want Nvidia is the RTX 4070.
Order Asus GeForce RTX 4070 Dual OC 12GB GDDR6X PCI-Express Graphics Card now online and benefit from fast delivery.
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The RX 7800 XT is still faster, personally IMO the 4070 is also too expensive for what it is. Again might as well get the 7900 GRE instead.