If you aren't mechanically minded you may need the support of a local shop so try to factor in to your purchase decision what happens after you buy it, general maintenance, dealing with worn out components etc. If you are ok doing that yourself or have friends who can help you then you can buy online and deal with the issues. Many local bike shops don't like dealing with ebikes not bought from them and of course if adds to costs.
Mid-drive motors are typically the most powerful for hill climbing (legal ebikes anyway) but there are many exceptions. You are probably outside the budget of a mid-drive motor prebuilt ebike so you really need to be looking at a more powerful geared hub motor. Perhaps something around 60Nm peak torque if you have some very nasty hills. That is about the limit for hub motors. Some of the smaller wheel ebikes with hub motors have more torque.
That said it sounds like you are young and lightweight so most ebikes will deliver good results for you I would of thought.
Anyway my recommendation is this one with a rigid fork. They recommend it for hilly cities probably because the motor is more torquey because of the smaller wheels and it has a high quality freehub based drivetrain rather than freewheels of most ebikes at this price point. This gives you higher gearing for flats and downhill. Remember ebikes only assist to 15mph but most conventional bikes can go faster than this. It also has a thumb throttle which you may prefer to give you boost control of power when you need it. Also its in stock. Please note the height requirements though, for people under 5'5" they recommend the rigid forks (which I would recommend anyway) and a low profile seat post.
The Woosh Rambletta is the most recent 20kg folding bike from Woosh, with a large 36V * 10.4AH semi-hidden battery, very easy to stowaway, perfect for camping / caravanning.
wooshbikes.co.uk
Sadly there is no mention of the actual torque I can see.
Also bear in mind the £ has fallen recently so there will be huge inflationary pressure on ebike prices (again) soon for new stock coming from China and Asia. The £ will buy far less in future. So its a good time to buy probably before the next wave of price increases.