Matt197
South West Rep
I found some Panasonic CR2025 at a good price, works out at something like 0.21p each. Should keep you going for a good few years.
http://www.amazon.co.uk/gp/product/B002EVOA4K/?tag=clio197-21
http://www.amazon.co.uk/gp/product/B002EVOA4K/?tag=clio197-21