I have looked at the accessory fitting guide for OEM side steps and front mudguards but it doesn't help.

Is the mudguard "fixed" to the side step, or do they simply slot together? .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

The ones I had slotted into place and then had 2x self tappers going from the front face off the mudflap (under the arch)into the step to secure Is this where I put the car details and a bit about myself ?........

Mine were slotted together. The mudflaps aren't attached to the sidesteps. There is a plate which is screwed behind the lower body panel. The panel has to be removed to access the bodywork behind. The side panel is replaced and drilled through to allow the screws to pull the mudflaps into the bodywork.

Mine are OEM supplied by Dan at Duckworths.

Powerful UK have a useful video which shows how to. John
2008 Stornoway Grey 3.6 Tdv8 Vogue
2005 TD6 Java Black Vogue - Written off!!
GAP iiD BT
2003 Discovery TD5 Auto, Nanocom Evolution - gone to a new home!
MasseyFerguson 152 - No electronics!! - Sold

Many thanks, sounds like there are options! Pretty certain mine were factory fit so will go carefully  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

the genuine ones have a nut and bolt under the front end of the step securing the mudflap to it. The pattern ones have a screw that goes into the step from the wheel side.

I've replaced the rotten genuine steps on mine with pattern ones, but kept the original muflaps (they're better), just needs a small piece cutting off the end of the step.