Throw away any supplied lead with anything except a 3-pin UK mains plug on the supply end. It looks as if you need bog-standard IEC connectors for the equipment end. These are commonly supplied with just about every portable appliance sold in the UK. Haven't you got a box full of them? :-) If not, any electrical shop will sell you some.
Though the term is often used loosely, the "kettle" plug is actually a heat-resistant variant of this with a slightly different shape. Cut-outs align with lugs on a kettle, preventing the low-temperature version from being used.
There's not much studio gear that needs more than a 3 amp fuse. The Moog certainlt won't. The Mackies - well, there's a pair here. Let's have a look. It says 150W on the back. Volts divided by Watts = Amps. Yeah - a 3 amp fuse will be plenty!