Cissie.
Shoe Lane is now classed as a Path on OS map.
It is off Simpson's Lane, which is off Grant Street. Post Code IV3 8HE.
Ref the Merkinch Hall...it has not got a number in the postal address. It is shown as Merkinch Hall, Shoe Lane and sometimes as Merkinch Hall Simpsons Lane.
May I suggest that 5 Shoe Lane was a dwelling? My GGF/GGM and family (my GF aged 2) lived at 7 Shoe Lane in the 1881 Census, later in 1891 in Church St, also Nelson St, Brown St and in McLennan Crescent. One family member died aged 9 months at 8 Shoe Lane in 1914.
It was also very common for people to be married in private houses as opposed to churches.
Hope this helps.
Edited to add : 1881 Scotland Census Dwelling 5 Shoe Lane occupied by Chisholm family.