In order to supplement services 58L, 58 and 58P a trial service will operate for three months from Monday 2 June 2025 by using the Seiriol community minibus. This service will be limited to Mondays and Fridays operating from 9am to 5pm.
Two routes will be operated; the intention of the two routes is to get people to Beaumaris and back and the times are attempted to coordinate with the above services.
Route 1 serves Llanddona and route 2 serves Glanrafon and then, in a clockwise direction, takes in Eglwys St Cawrdaf and Penmon:
Route 1
| Route | Time | 
| Beaumaris | 10:10am | 1pm | 2:55pm | 
| Llanddona, Ponc y Felin | 10:27am | 1:17pm | 3:12pm | 
| Llanddona, Maes Gwyn | 10:36am | 1:26pm | 3:21pm | 
| Beaumaris | 10:44am | 1:34pm | 3:29pm | 
Route 2
| Route | Time 
 | 
| Beaumaris | 9:20am | 10:55am | 12pm | 1:55pm | 3:50pm | 
| Glanrafon | 9:35am | 11:10am | 12:15pm | 2:10pm | 4:05pm | 
| St.Cawrdaf Church | 9:46am | 11:21am | 12:26pm | 2:21pm | 4:06pm | 
| The Pines, Penmon | 9:55am | 11:30am | 12:35pm | 2:30pm | 4:25pm | 
| Beaumaris | 10:03am | 11:38am | 12:43pm | 2:38pm | 4:33pm |