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Cashing a cheque on behalf of someone else
If the cheque is crossed (as almost all are these days), it can only be paid into an account in the name of the person it was written out to: it cannot be paid into another's account, nor can it be "cashed"1 – see the rules on "Crossed" cheques. Note: that while the recipient of the cheque cannot (legally) alter this state of afairs, the writer of a cheque that was printed pre-crossed can – at least technically – cancel the crossing (see above link). Probably the best the OP can do is pay in the cheque on the friend's behalf (as described in Ben Millwood's answer) and then either lend the friend some money until they are mobile and can get some cash to repay the OP (or have the friend write one of their own cheques which the OP can pay into their bank account). 1 As mentioned in the last section of the rules on crossed cheques, the only exception is that designated "Cheque cashing shops" have special arrangements to deposit cheques which they have cashed (after deducting a fee). However, they would (should?) require proof of identity (of the original payee) and so are unlikely to be of any help (and probably not worth the cost for £35).  Having said that, I've never used one, so have no idea how strict they are in practice.