Gill,(posted 8016 days ago)Further to my earlier message. If you go to "www.boltoncab.co.uk/factfiles/limitations.htm",you will find the answer under General Principles,Subject Area.It's a useful web page.
The Prescription & Limitation (Scotland) Act 1973 sets out which obligations prescribe after 5 years,but you may need to check for amendments(see Jim Wallace ""www.scottish.parliament.uk/official_report/wa99- 00/wa0218.htm" he gives a little more info.)
Hope this helps,Mark.