I wear the muck boot jodphur boots and they are fab. Really warm and waterproof and it means you can walk across a muddy field then just hose them off before riding. I bought mine on ebay.
Can't believe how warm they are, should have got some a long time ago. I got mine from Discount wellies.co.uk, was the cheapest I could find online. £39.95 + £6 postage.
Oh - just realised you meant muck boots not muckers!
Have got a pair of the long muck boots and they are really warm and cosy but agree they can also be a bit slippy.
I do like them - husband bought them for me ... I personally wouldn't have paid the best part of £50 for a pair of wellies!!
My muck boots are seriously toasty in winter, too hot in summer - when mine eventually die I think I will get the riding version next. Super comfy too.