Beware - Scam
The total showed as 40 GBP but when I was about to pay I noticed they were going to charge me 340 EUR or something similar. I didn't accept the payment. Now I'm afraid that they have our passport details. Only have this permit issue by the official government website with the gov.uk domain and you don't have to pay anything extra. It's also dead easy. I don't know how I oversaw this detail.