Track-end surgery

Job's a good 'un - if track ends are cheaper then I'd go down that route. What's the cost in puppies?

Kiwi Cycles quoted me 80 sovs...awaiting SuperTed's reply. My trackend of choice is the Paul Component stainless steel one as it has an integrated axle keeper to maintain chain tension and cost 35 sovs but worth it IF they can be fitted retrospectively.