It seems the stem seals have gone in the main stop tap in my house, which is
located under the kitchen sink. Its not leaking much, but am getting the
occasional drip, which is causing a minor nuisance.

Incoming main appears to be 25mm blue polypipe, other side of the tap is
15mm copper.

Replacement stop-taps seem to be cheap enough to pick up online, however are
these things easy to replace?

The mains supply can be isolated before that as there's a meter/stopcock
outside, but haven't yet looked to see if I need a special tool (at my last
house I seem to recall you needed a special square shaped key or something
to turn the water off in the road).

I'm a relatively competent handyman around the house. I assume, provided I
can turn the water off outside, replacing this shouldn't be a difficult
task?


--
Best Wishes
Simon Taylor