You haven't asked for advice, but I thought my answer might help others.
I think the thing to remember with cholesterol test results, they should never be seen in isolation, because the result you get is actually usually made up of three results, you only get given one figure (the sum of all three). But it is very important what all three results are, as to the significance,or not, of the rise. It's important what the ratio of each component is to the other. So if you haven't already and you're interested, I'd ask for a print out of your bloods, so you can see what element of the whole is raised.
The first thing is, you are doing a lot of good to your body by cooking and baking your own food, you know exactly what's gone into your food, so that's perfect. But, you do, as @nebristolred suggests, need to careful when choosing plant based spreads etc. they undergo for the most part of lot of processing, (which can cause inflammation in the body and inflammation is now seen as one of the route causes of many of our modern diseases) unlike the traditional fats used by our parents, butter,lard etc. Funny how we're more obese and have more cardicac disease etc. since the introduction of all these so called health foods, which are supposed to be better for us, than pre 70s!
There could be other factors to the rise in your case and I'm surprised if they weren't discussed. Maybe it's possible other factors had changed by the time you had your blood rechecked and it had reduced?
Obviously I don't know your medical background and don't have your results to see, but in my experience I would be looking at lots of other sources for current dietary advice, rather than the NHS. I know because I was in it, that there's still a lot of catching up to do, with regard to diet by the NHS. They are brilliant at what they do, but like many things, they have a little knowledge about lots of things. Unless they are specialist in that particular field.
I'll give you a good example. Up until recently the advice for diabetics has been a low fat, carbohydrate diet. It's rare that patients ever came off medication once on it, and that's been their lot for the remainder of their life pretty much. However, my GP practice and others and the Diabetes UK website, name a high fat, paleo,keto diet (among others) as a potentially good diet to follow for diabetics. This advice to patients would have been unheard of 20 yrs ago. The result is some patients being taken off medication all together, having medication reduced and not seeing the huge highs and lows of previous blood sugar results. It would take too long to go into why, but suffice it to say, fat, meat,butter,dairy etc does not raise your blood sugar, which in diabetics, is crucial for Diabetics. Essentially fat doesn't get broken down into sugar, unlike carbohydrates that do. Despite the growing evidence in support of this the NHS have been very slow on the uptake.
@Slippin cider is right all things in moderation.
Diet is a very complex subject, factots like heritage, sex, age, etc all have a bearing on how foods affect you, so no one diet fits all. At a time when the thinking on fat (not trans fats, which are generally accepted as problematic) is changing from negative to more positive, a plant based diet is also being pushed as the way forward, so no wonder people get confused. I think the main thing to take away, is as much as possible steer clear of processed foods, cook/bake your own food where possible from scratch, a treat once a week is fine and you're more likely to stick to healthier foods for the rest of the time, if you're not completely denying yourself something. Finally, never underestimate keeping yourself hydrated.
Finally finally, I love baking
