they quoted me £25 but postage to them and from them is extra so that bumps it up quite a bit
I dont know if they offer fittings near to them but they definitely dont further away
Yes you just send them the saddle and a template, they don't come out and fit as far as I know. Bear in mind if you widen a saddle you effectively make it more curved and it will probably need a flocking adjustment to keep it working. Narrowing a saddle can also sometimes require the flocking to be altered.