Only the examiner or instructor that signs the licence needs to complete and submit the 1157. This needs to be done at the same time as the 3108 since the pilot revalidating has to fill out section 1 of the 1157 and sign where necessary. The examiner then gives the pilot a copy for his file. For revalidation by experience it was historically always an option to use the 1157 anyway. There is no replacement of a form, the authority has just effectively introduced a new online form for the pilot to submit which was not required in the past. The examiner has no involvement in the 3108 and his/her task is virtually unchanged. In fact, by using only the 1157, no recording of hours is required. I predict, in the fullness of time, the authority will realise they no longer know how many hours PPLs are flying!