oh so cute! the little harness is a good choice -- i've had one for my little terriers, and the two times i was in a hurry to get them out and just attached the leash to the collar, i realized the harness was truly protective of their necks and vocal chords.

There is always room top/bottom to accommodate blankets and such. That should hold true for just about any head board/ rails/footboard style bed. It does sound like you have more than average. A standard kind is wider and shorter than a CA king so it isnt to accommodate the size difference from one king to another as many beds have the option of moving the rails from king to CA king. a CA king is the longest mattress you can buy that is considered a standard size. Since you have had the bed so long I doubt there is anything you can do to remedy that situation.

I would had some architectural details like panel moulding to balance the vibe you have going with your bed (love it and I usually don't like pink in general). It's a big space and a tone on tone application of panel moulding in a light colour with punches of colour and pattern (mix up size of pattern for interest but keep it in the same colour family to keep it from being too busy). Jewel tones are really fun to play with because you can go wild or customize to your personality an taste. I got the "not a girly, girl" reference so bring in black, not too much but a small amount will ground the space, balance out the girlishness of the pink and still feel light, lux and like you. Any search with jewel tones and neutral rooms can give you ideas of how to work with the pink. Graphic and black with jewel tone Grey pink and white with a hint of black. Your linens can be added to the pink bed and introduce texture and pattern. Neutral walls keep it light and give you the latitude with patters. Moulding and trimwork add to the luxurious feeling of the room. You can double down on the pink paint or wallpaper a matching wall behind the head of the bed and then add an all white furnishings and art to balance to the bed. The rest of the walls should be neutral though. Your rug is a dark neutral but you can layer another rug at the foot of the bed, maybe include a bench in wood. Neutral colour of the rug can work with the pink. You have so much space, which is a challenge depending on your budget but get a colour palette and design style confirmed and then spend time building the room out. The bed is a great starting point, it is definitely a statement piece.

There are third party services that will ship from the US to overseas destinations. One Kings Lane list some in their FAQ section under Shipping and Delivery. Alternatively, post this on the UK Houzz site. Someone there might be able to help.