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Do you need a building warrant to move an internal door in a wall that is not structural? And planning permission? Does anyone actually apply for these things?

One of the elements on our ceramic hob has failed. Can I replace it with a similar ceramic hob myself or am I required to get an electrician to fix it? I've undertaken many minor electrical wiring jobs around the house over the years and so this is well within my capabilities. The existing hob has a rating of 6.0kW and it runs off the same 6mm cable as the oven which is rated at 5.4kW. I'd like to replace the hob with a Hisense one rated at 6.4kW. Is the extra 400W significant or can it be considered like for like? The old hob is 20 years old and no longer made.

Hello i wander if anyone can help im looking at replacing my mixer shower but have some issues all the shower im finding are saying that the mixer connects to the hot on the left and the thermostatic on the right my shower is the opposite the thermostatic is on the left and is attached to the hot water and mixer on the right.