Welcome to CD Freaks/MyCE
For transit insurance, generally most online shops ship by courier, which has its own insurance. The main thing to watch out for is that when you receive the package, make sure there is no damage before signing for the parcel.
All new laptops have at least a year warranty, so if it breaks down in the first year, you can ship it back to the store for repair. As the company is in the UK, you’ll need to consider this extra shipping cost should the laptop break down.
For long term insurance such as against theft, power surge, etc., your home insurance will most likely cover this. Some policies even cover accidental damage. For example, a few months ago, we had a lightning storm which hit the telecom lines and blew several PCs and laptops in our area (I was lucky to be home to have everything unplugged.) Those I knew who had house insurance had no problem getting their computer repaired with the cost covered by their home insurance.