MINI losing water - what's the fault?

My girlfriend's MINI was getting its MoT recently and the mechanic said the water pump had a slight leak. Since then the radiator reservoir needs filling every week.

The heater is also taking ages to warm up, so I assumed it was lack of water, Would the pump seem to be the problem? I'm no mechanic but just looking for ideas before I take it to garage. I can't see any major puddles under the car.

Asked on 6 November 2014 by easypeasy

Answered by Honest John
This: 27-1-2013: Coolant pipe to heater matrix can gradually get worn through by part of the gearchange linkage, leading to loss of coolant and potential overheating/head gasket problems.

Is on the list here:
Similar questions
I have a 2001 Mercedes-Benz CLK convertible and it has started running warmer on longer journeys. The water and engine oil are topped up. It normally runs at above 85 degrees then shoots up to 100 degrees,...
My wife's 2007 Colt CZ1 1.1 petrol is our runabout and does mostly short journeys with the occasional longer run. It's done just over 41,000 since new in Dec 2007 and has been trouble-free and a great...
Last week, I was driving home in my 1994 Renault Laguna when I noticed the temperature gauge was rather high. I pulled over and steam started coming out of the bonnet. When I checked the car, the water...
Related models
Fast and fun.

Value my car