If you changed to insultard last night, don't make any adjustment until the weekend, as you need to give it a chance to settle in to see what it's effect really are! This goes for any time you adjust your background insulin, one adjustment wait a couple of days the review..
Firstly I am surprised that your consultant decided to change you to insultard before trying splitting your insulin, as your problems may be that either your Lantus is running out before the 24 hours (common) or with one injection you end up with having enough at one point, but too much at another point, splitting the insulin into am & pm helps to resolve both these problems..
Another consideration, is that when I used insultard many moons ago now, I took this am and pm this was the standard for injecting! with breakfast and teatime!
Looking at your breakfast reading..
A very nasty spike, but what is concerning as well your tail end part of the novorapid is dropping your BG by too much.. Shouldn't be having a drop of 7mmol/l's between 10am and 12pm this suggests that you have too much background insulin.. So the background instead of keeping your basal line stable it's actually working with the novorapid and reducing your BG... Not good..
Personally on Sat or Sunday morning I would arm myself with plenty of testing strips, hypo kit, and carry out a fasting test to see what my basal line was like!
Plan the morning so that you aren't running around or doing excessive exercise, start testing as early as possible then keep testing until dinner time if you can manage.. Avoid carbs and protien (protien will impact on the Blood Glucose) if you need to tie yourself over hunger wise (sugar free jelly is always helpfull) Then test every hour to see what's going on..
Don't forget though if you have an hypo or BG's gets too high, abort the testing and treat accordanly.. Even if you find you have to abort, hopefully you will have enough data to determin whether it's the background insulin or quick acting you need to be looking to sort..
As to your spike..
A bit excessive, but this could just be a timmig thing where instead of injecting before you eat breakfast you can curtail it by injection 20+ minutes before, it's a case of trail and error to find the point where you won't go hypo before or just after eating and the point where you bring the spike into a reason level for good control... Or whether you'll better changing the food you eat for breakfast to one that doesn't spike so high!