Travel visa for Mozambique for Canadian and UK citizens?

The Foreign Office contains this advice...

British nationals need a visa to enter Mozambique. Those travelling for work purposes must obtain a work or business visa before travelling.

Tourists may be able to get a single-entry visa valid for 30 days on arrival. However, there have been reports of visitors being refused this service and being turned back from border posts and airports. It is therefore much safer to get a visa before you leave the UK. You must present on entry a return air ticket (for air travellers) and either an invitation from family / friends or a confirmed hotel reservation.

Source: Mozambique Travel Advisory (UK Foreign Office)

The Government of Canada offers this advice...

Canadians must also be in possession of a visa.

Tourist visa: Required Business visa: Required Student visa: Required Residency/employment visa: Required Transit visa: Required

Tourist visas can be purchased from the Embassy of Mozambique in Washington, D.C. (single- or multiple-entry). While single-entry visas can also be purchased from any point of entry, including airports and border crossings, they are increasingly difficult to obtain. It is strongly recommended that you obtain a visa before arriving in Mozambique. There are reports of travellers being sent back upon entry for not having a visa when they are arriving from a country where there is a Mozambique diplomatic post

Source: Travel Advice and Advisories (Government of Canada)

Despite the text informing that Canadians can receive a visa at an 'entry point', they indicate the chances of getting bounced.

Summary: Based upon what's written by their respective governments, both Canadian and British nationals should get a visa in advance of travel. Both nationalities have the additional option of playing 'immigration roulette' at the airport.