"There are a number of reasons why the peregrines are late laying eggs. It could be the age of the birds or the fact one of last year's juveniles is still in the area, which can upset the balance."
She added: "Whether you are on your way to work or browsing the shops, it is a great opportunity to see the fastest birds on the planet, so keep an eye out for the RSPB green marquee and come and join us."
In addition to seeing the birds through a telescope, peregrine fans can get daily updates from a live webcam. If you have any updates on the birds, these can be reported on Twitter or on the RSPB North West Facebook page.