Zara Phillips has described the prospect of making her Olympics debut at London 2012 as "different class".
Phillips completed a successful final run with her London horse High Kingdom at the Barbury International Horse Trials in Wiltshire.
She finished fifth in section B of the CIC two-star category, where her London-bound colleagues Piggy French (DHI Topper W) and William Fox-Pitt (Lionheart) were third and seventh, respectively.
Although 2006 world champion Phillips will compete again before the Olympic eventing begins at Greenwich Park on July 28, High Kingdom's next scheduled appearance is not until then.
"I am really pleased with him," said Phillips, the Queen's granddaughter.
"He felt good, and he was very accurate.
"The horse has really improved a lot in the last year.
"I have always known he was a good horse, but he has learnt so much. His weakest phase is the dressage, but he is still learning in that phase and getting stronger. We just have to keep working on it.
"We had a good result at Saumur last year, and then he really stepped up at Burghley. He is much stronger this year, and he handles the (cross-country) tracks very well.
"We had so much fun at Burghley, and this year he has grown. He felt fantastic at Bramham a few weeks ago."
Phillips clinched her selection for the Games with an impressive performance under pressure at Bramham, and she will arrive in London as part of a strong British team alongside Fox-Pitt, French, five-time Olympian Mary King and double 2008 Olympic bronze medalist Tina Cook.
"High Kingdom is a very relaxed horse - he loves his job," Phillips added.
"(Owner) Trevor Hemmings is so excited by the Olympic selection. He has supported me for a long time now, and we bought the horse as a youngster.
"At this moment, you are trying to get through everything and get there (London). Then for the competition it is all focus, and when you have finished it's relief.
"But it is just going to be different class going to an Olympics on your home turf. It is very exciting to be part of the team."
World number one Fox-Pitt effortlessly nurtured Lionheart around the Marlborough Downs cross-country course, with 14 time faults meaning little in the general scheme of things.
"I am very pleased," he said. "The plan was to have a run at Salperton last weekend, and then again here.
"Neither weekend was about being competitive, it was about getting the horse to Greenwich in the most relaxed frame of mind possible.
"He can be quite tense - he is very keen to do well and to do right - which is why I have run him twice recently."
Leicestershire-based French, winner of the Olympic Test event at Greenwich Park a year ago on Topper, also enjoyed a trouble-free day for third spot behind winner Kitty King and runner-up Paul Tapner.
"I am happy. He feels in very good form, and this was the perfect place to come and do a last run (before London)," she said.
"The ground was superb, and it was nice for him to go out and have a confidence-giving run.
"The pressure will be on in London, without doubt. We just have to focus on the competition and forget about everything else."
Cook and King, meanwhile, each jumped clear in the three-star showjumping ahead of tomorrow's cross-country finale.
Cook lies 10th overnight and King 13th, but New Zealand's prospective Olympic riders again served notice of their London credentials by filling the top three places.
Andrew Nicholson, World Equestrian Games bronze medalist two years ago, leads on Avebury, with his fellow New Zealanders Jonathan Paget (Clifton Lush) and Mark Todd second and third, respectively.
The New Zealand eventing team for London will be announced next Tuesday.French carried her strong form into both remaining sections of the CIC two-star category.
She won section D with Kiltealy Brief, finishing on a dressage score of 41.4, with Dani Evans (Raphael II) second and Daisy Berkeley (Springbok IV) third.
And French was second in section C, riding West Side, behind three-time Olympic medalist and Badminton champion Pippa Funnell, who is among the reserves for London, on Billy Beware, while Oliver Townend was third.