Hi Fleur,
Looking through the photos I have I didn't find any truly orange ones. The following all have some pink hue as well as orange. Try 'Meilouvea', 'Lapural' and (one of my favourites) 'Morning Sun'. As for yellow, a little more luck here. 'Banzai', 'Judit', 'Marco Polo', 'Tequila', 'Solo Mio', 'Vendee Globe' and 'Spahi' might be of interest to you. I can't say anything about size as all the bushes are clipped to a uniform size in the garden. Photos of all the above will come up here as I get to them alphabetically but you could look them up on the internet in the meantime. Good luck with your replanting plans :-)