I think you should continue to save those pennies till you get to £3k at least.
Its like everything, you very much get what you pay for and whilst £2k might see like a lot for a bike, the 'E' part of it leaves you with a bike that probably retails at 400 quid and it pretty much the bottom of the range.
By going a bit higher, you enter the realm of decent spec and more capable riding.
These bikes are available to bike in regular bike shops, so if any problems, they are easier, far far easier to resolve.
If you can ,try to stick with something with a Bosch motor.
In simple terms 'Hill ascending power required' is made up of 'your input' plus 'motor input'
Yes, its usually written as a percentage. So for example on for example a Gen 4 performance CX bosch motor, its outputs might be - Eco (lowest assist) 60%. So for the effort you put in, it multiplies it by 60%.
Tour+ is the next setting,, and that gives you 160%.
EMTB(effectively an automatic gearbox that acts dependent on how much force is applied by the legs) at between 160%-360%
Maximum is 360%
On something like 'tour+' that, along with gears is going to make hill climbing much easier, on maximum(360%) you're pretty much going to go up anything in pretty much any gear.