Prince William says the duke was "extraordinary" while Prince Harry says he was the "legend of banter".
Britannia Royal Naval College is observing a week of mourning after Prince Philip's death.
Salons offered early-morning haircuts and pubs served midnight pints as England's rules changed.
Footfall doubles as queues form outside branches of Primark, JD Sports and TK Maxx.
The former PM is at the centre of a row over his efforts to influence ministers for a finance firm.