If you buy an iPad you will be looking at a high end price tag. The latest iPad (2018) will cost between £319 to £409 depending on your chosen specification. If you are looking for something more powerful the iPad Pro, which is available in two sizes (12.9-inch or 10.5-inch), is available for between £619 to £1,119, which is a lot of money.
That's not the end of it either, if you want a snap on keyboard, case or a sim card for cellular data, they will all cost you more.
So if power is what you're after, another option is the Surface Pro (2017), coming in at around £800. It also houses a Core i7-7660U processor, 16GB of RAM and a 512GB Samsung KUS040202M SSD, making this machine pretty impressive.
Alternatively, the Surface Pro 4 is another good option. It is not exactly new, but it is very powerful. Although, for £750, it isn't exactly the cheapest.
If your budget doesn't stretch that far then the Chuwi SurBook Mini, Chuwi Hi13 and Xiaomi Mi Pad 3 are all great options, coming in at £130-£300.
Although, arguably the Amazon Fire Tablet comes top of the class for budget tablets. Depending on the version you get, you can expect to pay between £49.99-£179.99.