Cut Out and Wont Start

There are varies fuses related to the starter , ignition , battery , alternator etc . and relays that you need to check out

Ford Fiesta (2002 – 2008) – fuse box diagram
Year of production: 2002, 2003, 2004, 2005, 2006, 2007, 2008

Fuse Box on the Dashboard
Ford Fiesta - fuse box diagram - dashboard
Ford Fiesta – fuse box diagram – dashboard
Number A Description
F1 — —
F2 — Trailer towing module
F3 7,5 Lighting
— Trailer towing module
F4 10 Air conditioning, blower motor
F5 20 ABS, ESP
F6 30 ABS, ESP
F7 15 Transmission
F8 7,5 Power mirrors
F9 10 Left low beam headlamp
F10 10 Right low beam headlamp
F11 15 Daytime running lights
F12 15 Engine management
F13 20 Engine management, catalytic converter
F14 30 Starter
F15 20 Fuel pump
F16 3 Engine management
F17 15 Light switch
F18 15 Radio, diagnostic connector
F19 15 Daytime running lights
F20 7,5 Instrument cluster, battery saver, number plate lamp, generic electronic module
F21 — —
F22 7,5 Position and side lights (left)
F23 7,5 Position and side lights (right)
F24 20 Central locking, alarm horn
F25 15 Hazard warning lights, direction indicators
F26 20 Heated rear screen
F27 15 Horn
F28 3 Battery, charging system
F29 15 Cigar lighter
F30 15 Ignition
F31 10 Light switch
F32 7,5 Heated mirror
F33 7,5 Instrument cluster, battery saver, number plate lamp, generic electronic module
F34 20 Sunroof
F35 7,5 Heated front seats
F36 30 Power windows
F37 3 ABS, ESP
F38 7,5 Generic electronic module
F39 7,5 Air bag
F40 7,5 Transmission
10 Light switch
F41 7,5 Transmission
F42 30 Heated front screen
F43 30 Heated front screen
F44 3 Radio, diagnostic connector
F45 15 Stop lights
F46 20 Front screen wiper
F47 10 Rear screen wiper
F48 7,5 Backup lamps
F49 30 Blower motor
F50 20 Fog lamps
F51 15 Cigar lighter
F52 10 Left high beam headlamp
F53 10 Right high beam headlamp
F54 — Trailer towing module
F55 — —
F56 — Trailer towing module
Relay
R1 Power mirrors
Lighting
R2 Heated front screen
R3 Ignition
R4 Low beam headlamp
R5 High beam headlamp
R6 Fuel pump
R7 Starter
R8 Cooling fan
Daytime running lights
R9 Daytime running lights
R10 Charging system
R11 Engine management
R12 Power mirrors
Engine Compartment Fuse Box
Ford Fiesta - fuse box diagram - engine compartment
Ford Fiesta – fuse box diagram – engine compartment
Number A Description
F1 80 Auxiliary heater (РТС)
F2 60 Transmission
F3 60 Auxiliary heater (РТС) / Glow plug
F4 40 Cooling fan, air conditioning
F5 60 Lighting, Generic electronic module (GEM)
F6 60 Ignition
F7 60 Engine, lighting
F8 60 Heated front screen, ABS, ESP
Engine Compartment Relay Box
Ford Fiesta - fuse box diagram - engine compartment relay box
Ford Fiesta – fuse box diagram – engine compartment relay box
Number Description
R1 Air conditioning
R2 Cooling fan
R3 Auxiliary heater (РТС)
R4 Auxiliary heater (РТС)
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

Thankyou, I checked the fuses and all seem to be okay, need to double check the Relays though.
Any chance it could just be a bad grounding earth ?

Wont go wrong checking earths and battery terminals , any earth from gearbox to body also

Thanks, I'll let you know how I get on.