This was our first visit to Luton airport & using self parks. We found the location easily with instructions on confirmation. On arrival we were directed to parking spaces. Several marshalls were on site to assist. There was a bus waiting. The bus made 2 stops in car park then headed to airport which took about 7 minutes. Dropped off right outside. Given a ticket for our return journey. On our return found bay easily & only had to wait about 15 min. We were at the front of the queue so we must of only just missed the previous bus. When we were dropped off in the car park, it wasn’t very well lit & we couldn’t find our car. Other people were having the same problem. There didn’t seem to be any marshalls about. Eventually, we asked a guy sitting in a van & he explained the coding system had been changed & we were now in c not j. It was confusing. That would be my only compliant. Everything else ran smoothly.