PIP is usually paid every four weeks in arrears into your bank or building society account. However, if you are awarded PIP under the special rules (see Box B.7 ), it can be paid weekly in advance.
UCPIP(C&P) Regs, reg 48(1)-(2)

Appointees – If you cannot manage your own affairs, the DWP can appoint another person to act on your behalf (see Chapter 54(4) ).