"Nick" wrote:
are they more than likely going to be living as a family up there? i've
caught one in a trap so far (last night) and
theres been no more since.

Probably a lost and lonely soul, Nick. Most field mice come into houses
for warmth and shelter in the autumn, usually through unattended open
doors. You could try looking around to see if there are any obvious gaps
around the eaves and proof them with wire mesh to stop reoccupation. (Far
more humane than the breakback traps).

If you do have more mice, you'll soon know, as it's amazing how much noise
they make. IME, their nocturnal goings-on, just above your bedroom at
03.00, makes you think that there must be a whole flock of birds in your
loft

- Tom.