You can go to any Roman Catholic Church, and observe a mass. You may not know all the prayers or when to sit, pray, kneel, etc. And you cannot participate in communion, but you can most certainly attend and it is welcomed. You can also go to RC Church at anytime and ask to talk to a Deacon or Priest and discuss things with them. In the USA we have an RCIA (Rite of Catholic Initiation for Adults) you complete a number of classes with a priest, deacon, and/or parishioners all leading towards confirmation and communion ( I am assuming you were baptized in the church of scotland). Go talk to people, I think they would welcome you.