No special access issues
The approach trail shown walks in from the large layby just to the North of Nant Peris. Traditionally, people would park at the pay and display car park in the village of Nant itself and then follow the river north to meet up with the shown trail. However, the layby is free and often quieter during school holidays when Nant can be overwhelmed. There is little to no difference between the walk ins (unless you are prepared to cross the river early).