discovery 1 v8 wont start poss alarm

hi its been a while since I was last on with my series now I got a disco v8 and regretting it lol. done lots of looking on google but need expert advice pls .
prob is not starting it was running before it turns over ,,i have no power to coil thought it was the spider system, after taking control panel off it already has the bypass in , ive cg]hanged the battery in fob even took battery off ,still wont start , ive also checked the relays in drivers foot well or at least listened to them and they both click on and off,
pls help its driving me potty , any advice would be much appreciated