Namaste
The words Community Center reveals the main function is as a mandir serving the community needs of Hindus who came by diaspora to Scotland, so typically residence for all the main Devatas of the trinity, you cannot say it serves only Siva (Saivas) or Vishnu (Vaishnavas) but both and we see also Ganesh and Krishna and Ram.
The building has a good history, it recently underwent rennovation but the community is not rich diaspora Hindus, not like many Indians in the US. You will enter by two large double doors, with a welcome mat and you will not be denied welcome.
Those attending will be 90 percent or more diaspora Hindus as the building is to serve as facilities for wider community use for this diaspora community, but do not be afraid to good to this historic building if you are Scottish and not "Indian".
By the way these will be "Indians" from Africa and colonial legacy and not much from India. They will be mostly Gujarati, there is a swing to Avatar worship such as avatars of Vishnu but they are community and cultural based and thus all sects of Hinduism are given representation, nor do they like discrimination of any sorts due to some bad examples of discrimination against them in some cases in Afirica, so they will in no way be un-welcoming to you. There are also some Pujabis and Biharis there, again this is not a wealthy elite at all, and is satsang oriented meanings getting together and there might be singing, even cultural dance activity, it appears there are not yet murtis or "statues" (forms) of the Shiva, Vishnu, Ganesh and so on, but pictures framed.
Many of those you will see will be small shop owners running shops in areas of Indian goods where there are also Sikhs. They are accustomed to being with others who they may consider to be of "another religion", do not be worried to go if you think they may first think you another religion it won't matter, show respect bynremoving shoes. There will be a yuung man who may want to talk to you, typically he will also be a student in school.
I do not think an "official priest" has been hired, this may have changed with the influx of some money, but likely the feel will be more of a mandir with worship a little less formal than as found in a full Hindu temple.
This temple is in an old church on a back street, and was once almost to be condemned if not rennovated, the diaspora Hindus purchased it and saved this building which is in an area that is not noisy and few neighbors of family.
They appear to hire out a base hall to other non-Hindu activities to raise funds. You do not need to be shy to visit, some will be more shy then you from this community hoping not to have you think they do something to embarrass their family in front of you.
Make sure you take your shoes off as soon as you see other shoes placed on the floor or in shoe stalls. Then first just observe, just sit on the floor if you see others doing so.
Please go. YOU will know exactly what to do moment by moment, by instinct and observation. Do not be afraid. You will see two double-doors at the entrance. If shoes are just outside, take your shoes off, then put you hand on one of those door handles if not already open. Open that door. Think of your friends in Hinduism who say, just open the door. We are with you in spirit even thousands of miles away. It will be very simple. You do not have to do anything. Just sit if you like if others are sitting. Just observe. Look at the pictures of the Devatas. You are doing what is only natural. You do not need to do more than that, you did a lot in just that.
Om Namah Sivaya