Lets look at what the 'lift kit' comprises ...
Longer front and back springs (Britpart by the colour)
Longer front flex brake lines (?)
Longer rear flex brake line (?)
Longer travel shocks .... (possibly)
The only thing that needs to change from that list is the (yellow) springs. ... a new standard set (front and back) will cost you around £120, there are plenty of resellers, look on eBay.
There are several (pre-owned) sets on eBay at the moment that will be just fine, some look as-new, for half that price.
You shouldn't need new fittings/turrets etc and these will have been fitted with the new springs and are the same for any size of spring.
You don't 'need' new shocks, but if you wanted to fit new ones then they are around £90 for the 4 (ie £200 for a set of springs and shocks)
The brake lines are (new) under £30 a set (+ 2" are £40) - there is really no need to change them.
Wheels and tyres.
The wheels will be fine, less aggressive tyres will cost you anything from £90 to £170 a corner, you could get a pre-owned set of boost alloys (like these
https://www.ebay.co.uk/itm/134253096108) for around the £300 mark.
Steel wheels are around £70 each (new) - there are a few sets with tyres on the Bay of E, here's a set for £475
https://www.ebay.co.uk/itm/175378310462