I grow it. Or, better said, I used to, because my garden is now gone and I'm hoping to make a new one.
Crown Princess Margareta is one of the best large English roses. Somewhat similar to Graham Thomas, Crown Princess Margareta is taller, wider, has long arching canes decorated in dozens of blooms, adorned with very intense tea scent and is excellent disease resistent. It's very vigorous, and as with many English roses, it takes a year to really take off and produce splendid blooms. Leave enough space for this beauty, probably close to fence/wall and well in the back of your garden. I had it with foxgloves, salvia and basil growing in front of her, just between Damask Mme Hardy and Ispahan.
In other wods, I encourage you to plant one or two old roses next to her as well.
Hope this helps a little.

I forgot to say, it repeats well, and more than that. It's very floriferous. In my garden I had absolutely no problems with it, no disease of any kind. It has semigloss leaves, which go well with old rose type leaves intermingled. Tie some branches to reach desired height and cover the wall, and leave some to arch down, where blooms can kiss foxgloves and smaller roses growing beneath.

Dear Meryle,
I bought CPM a few years ago and found the colour disappointing. It was much paler than the photos, more a peachy/apricot with a pink tinge. I didn't keep it as I already had Crepuscule and really wanted something much brighter. Standing a few metres back from them both, it was hard to tell the difference. Of course it might have come with the wrong label!!

Thanks very much, Tom - and the picture you paint of the planting you had around her is beautiful.
Wattleblossom, I pay special attention to your comments because you are growing in the same conditions I am. I certainly don't want a Crepuscule effect but every reference shows CPM as at least bright yellow. Do you seriously think you might have had a mislabel? Leaving aside the colour, DAs usually have much showier larger flowers than Crep. There is a nasty suggestion I'll experience deja vue if I go ahead, because I am thinking of CPM to replace a Bouquet D'Or which has turned out "peachy/apricot with a pink tinge".

CPM in Perth starts as yellow-orange and fades to pale yellow, in Graham Thomas fashion. But it has more petals than Graham Thomas. Blooms are really big, heavy. Crepuscule cannot compare to it.
If you don't want pink pigments that might be visible during the summer, go after Charles Darwin then.
But don't forget that colour is made of so many differet ingredients, and plant's food, climate and sun exposure being the most important.
Note of warning: orange and peach colour in roses is indeed made with pink/magenta pigment on yellow base. Grab a loupe and put your favourite orange petals between your fingers. And the intensity of yellow base and how quickly it changes (fades) makes blooms orange, or pinkish.
So nothing is wrong with roses. Where you plant them, and how you care after them, that's what matters.

I'm sorry, it was the colour that I thought similar to crepuscule not the size of the flower. I'm sure if you put the 2 together you'd see all sorts of differences, but outside in the sun, either side of the same arch, there wasn't the contrast of light and dark apricot and yellow I was hoping for. I bought it in quite a large batch from Gardenarium in SA and didn't have any problems with other roses, all DA's. If I'd got it from Mistydowns than the wrong label would have been a stronger possibility!
Meryle I feel for you, I know you want this rose as it looks lovely in photographs. Perhaps you could buy one and keep it in a pot for a while until you are sure the colour at least is right for you.
Do you grow roses in both Sydney and the mountains? Both locations have their challenges, but at least Sydney is warmer, although the humidity can cause all sorts of problems, just as the summer mists and heavy autumn dews do here.
Tom, I think you should write for a garden magazine.

Gardenarium is a new one! I shall have to check whether they are on line. Tom is right of course - lots of yellow/oranges fade to pink, but I am hoping for something bright and unpink to start with.
My rose garden is in Katoomba, surrounding the holiday cottage which I let out. To-ing and fro-ing to clean and wash linen is the perfect excuse to garden...and I just love having a cool climate garden though the current drought is very difficult to manage at a distance.
In Sydney I live in a terrace house with a very small garden which I grossly over-planted 30 years ago. The result is a shade garden, except for the side passage which faces north and in which I trial a few roses every year in pots.

I'm in Berkeley, California. I agree with all of the comments here. the color is much, much paler than the catalogue picture. I am not displeased because I was thinking about ordering the Crocus rose, which I no longer need because this rose really goes to cream in a hurry. I do love it. the only thing I have to add is that vase life is good, better than most other austins from 4 days in heat to a week in cooler areas of the house.

Most orange-peach roses fade in California when grown in full sun, which is 8 hours a day here. I give "Reve d'Or
2 hours of shade so at least in spring and Autumn its' pink coppery hues come out.

Luxrosa