Try rapeseed oil rather than olive oil, you can get it hotter before it burns and starts to smoke. Make sure you have a good quality spud which is quite floury, King Edwards or Maris Pipers are great.
Par boil them whilst the oil is in the oven around 200°C, drain them just as they’re beginning to soften. Drain them and bash them around in the pan to fluff the edges up. Put them in the oil, baste them, cover in salt and black pepper to taste. Roast them until theyre going golden, take them out, turn them and baste again. Tip the excesses oil away before putting them back in the oven. Roast them until they’re golden brown.
Tip, if you bash them around and there’s bit of spun in the sauce pan, you can scrape it out in to the corner of the pan and make crispy bits which are just for the chef. 🙂