A Blackcap (my first of the year) was singing when I left the house in South Cardonald first thing this morning.
Raven activity in central Paisley today consisted of:
08:30 - Lots of activity around the nest with both birds in the air at one time (being pursued by Lesser Black-backed Gulls), both birds at the nest and one removing something (possibly an eggshell) at one point. Presumably the female eventually settled on the nest, whereupon the male set about exploring various ledges and niches on the church itself and on nearby buildings (activity I have not seen before).

13:55 - Fifteen minutes of fairly intense activity around the tower with both birds soaring together and much exaggerated sweeping up to the nest, peering in, then swooping away again. Twice, one bird appeared to entice the other off the nest. On one occasion they perched in a tree together. On the second they flew low off west. Definitely more interest in the nest contents today. 

18:10 - The sitting bird got up and flew around the tower a few times before returning to brood. At one point it dangled its legs – presumably stretching them after sitting for so long.  

Other birds around Paisley at lunchtime included a singing Chiffchaff on Oakshaws and a Goosander on the river.