Do these solar panels look any good?

[Lightspeed]

Answering OP specific question

Calculate just 10% of solar cells' rated output in midwinter, although you'd still expect around 4 hours a day output at this time of year.

You'll also a need an invertor to convert 12v to the 240v that your mains chargers expect to see. Invertors frequently run at just 50% efficiency so you have to input twice as many watts of energy at 12v than you'll be getting out at 240v.( if that makes sense?)

Assuming a lap-top charger of 65w and 3 phones charging at 5w each, and all of them plugged in for three hours charging per day, by my calculation you'll need 7 x 175w rated panels to do the job in deepest winter, and conversely, these will of course be generating 90% over charge in the summer months so you'll need to decide what you'll be doing with that spare energy.

Another strategy would be to find a more efficient invertor and less device charging time to reduce the required generating capacity. With careful choice of components and non exhaustive demand from the lap-top and phones, you might get away with just three cells.

Don't forget backup batteries and charge regulation to complete the setup.