Vauxhall Corsa car will not start unless driven everyday! :(

My car runs fine if I drive it every day (morning) but if I go a day or without driving it then it is dead and I only hear clicking sound when I try to start it. I can then jump it then it will start and work fine until I leave it standing for a day. I had been advised by the AA that it was my battery so I have changed the battery since and I now have a heavy duty high voltage battery but still the same problems occur however this time the radio etc comes on but the car does not start just clicking sounds, I have since done a full service everything seems fine so I do not know what the issue is. Does anyone know what it could be? Maybe an electrical fault? I have also now got a spanner and car light come up on the dash board (I don't know what this means)