Doing some volunteering in conservation should be helpful. Check out the BTCV http://www2.btcv.org.uk/display/volunteer I volunteered in an ecology park with them for a few months last year, it was fun. I talked about it on my Personal statement and one of my University interviews (for geography)
I'm looking for workexp too but the BTCV doesn't have anything when I am available and I'd prefer something ongoing - leaning towards Physical geog / geology more. Need it to satisfy '' evidence of your enthusiasm for the subject''