I used them to install my Wallbox Pulsar Plus.
I had to send photos/videos of my meter box, fuse box and where I wanted my charger, along with a wide shot proving I had off road parking. They quoted for the charger plus a DCBO. I had to pay up front. The original appointment had to be postponed when my local engineer was hospitalised by electrocution! Two guys came a couple of days later from further afield, and installed it all Ok, and it's worked well ever since. I had to perform an update the 1st time, and several since. I did have to chase up for the installation certificate, which they emailed to me. They are part of Response EPR Ltd.
I'm happy with me installation, and it was £568 including the charger with tethered cable, DCBO, and the English Govt. Grant of £350. Which was cheaper than many other prices.
I would use them again.