With the utmost of respect and having had the both the benefit and experience of owning a 1.2 POP, leaving a service until 18k or 2 years is imvho, nuts.
The plugs on a 1.2 will be just about shot after 10 or 11k miles. I know this because I changed the plugs myself at 11k and they weren't in a good state, despite the car being driven with consideration. The pollen filter will need replacing after 12 months. More importantly, the oil and filter should definitely be changed by 9 or 10k miles. I had ours done at just over 4k miles on the first service.
The thing you have to understand about extended service intervals is that they were primarily introduced to appease fleet buyers to help reduce their overall service costs. This then trickled into the private buyer market to make servicing costs look attractive. Personally, from a private owner perspective, annual servicing or no more than 12k miles per annum is my own preference, though our own mileage rarely exceeds 8k per annum and therefore servicing is done then anyway.
If you want your engine to last and the car to perform to it's best and to help with resale value later down the line, in short showing you've taken some interest and care with your car, I personally wouldn't get drawn into extended service intervals. Just my opinion.