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@Scilly.Suffolk
The size of the headset is determined by the external diameter of the steerer.
No need to take yours apart just yet though: it has a quill stem, which means it has a threaded steerer, which will take a 1" headset.
For the bottom bracket, you will need to know the length of the spindle/axle, if the spindle tapers are ISO or JIS and whether it is British or Italian threaded.
Different cranks require different length spindles for a correct chainline: just measure the one that is currently fitted and/or check Velobase to confirm.
ISO and JIS tapers are interchangeable, but the equivalent spindles are 2mm different: for example cranks that need a 111mm ISO taper, will be just as happy with a 109mm JIS taper. Look at the end of the spindle: ISO have a 1mm extension chamfered at 45° on each end, which JIS don't, hence the 2mm difference.
There are two ways to determine if your BB is British or Italian:
1) measure across the frame where the BB fits (the BB shell), if it's 68mm then it's British, 70mm then it's Italian;
2) the drive side cup of Italian BB has a normal thread, so fastens/unfastens in the usual way; British BB have a left-hand thread so operate in the opposite direction to usual.
As you have a Dutch frame it will certainly have a British BB, the cranks are Shimano 600EX (check the reverse says FC-6200), which take a 116mm JIS taper BB (or 118mm ISO).
I've simplified things a little: here's a little more reading for you.