I would like to fix it and not have to wrestle the bolts anymore but new springs are circa £500 a pair from Lexus. Although I can source them much cheaper overseas even with shipping/duty, so I may get some ordered - they'll just take a while to arrive.
The other issue I have with buying new springs is that the rear may still be low, due to fitting to tow bar. If I shell out £500 and it's still low then I ain't gonna be a happy camper, I don't like flushing my hard earned away.
OEM dampers are also known to leak so I found myself looking at some TEIN coil overs earlier this week, they do a street/comfort range that have an appealing price. I just don't want to ruin the ride quality as the local roads are poor.
So in the meantime, I'll be refitting the OEM kit with some spacers and see how we get on.