Ideally about 4 months before you want to lease a vehicle. This will give you a few weeks to do some research into what vehicle you want, get some quotes and be approved for credit.
Most people want a specific vehicle and they want it straight away. This is fine, if you are not fussy about the spec and colour etc.
Many people wrongly assume that their preferred vehicle will be in stock, quite often this isn’t the case, especially if you are not willing to compromise on colour etc.
Therefore, we always suggest allowing about 4 months, just in case the vehicle you want has to be factory ordered - This can take anything from 8 to 12 weeks.