I paid £36 for both. The grill badge was very easy. I removed the two retaining screws, then I gently lifted the grill whilst pulling towards me and it popped off. There are quite a few clips along the bottom which would snap if too much force was used, so I think gentle persuasion is the key. You then have access to the rear and it's quite obvious how the badge is fixed. I used a small flathead screwdriver to help release the catches. Take the opportunity to give the grill a thorough clean, then push the the red one on until you hear it click, and put it back together.
The rear one took a bit longer because there was quite a bit of adhesive left behind to remove. I used the floss method to get the silver ones off. Prior to removing I made myself a paper template which I clipped to the boot to ensure the red letters went in exactly the same place. Fortunately the red ones came mounted on a small clear sheet so the letters were attached in one go, opposed to individually.
I'm really pleased with how it looks.