Many thks for the info
First thing I would do is charge ur battery up , needs to be roughly 12.4 volts , standing , low battery can cause all sorts of issues
Do u happen to have a code reader plse ,
When u done the belts did u replace the rear belt and oil pump cover , new tensioners , etc , plse , or just the front belts
So basically it will keep cranking over but not fire, unless u lock and unlock the vehicle
Have u got more than one key plse , are u using the key u normally use
Someone else should also be along but indeed first thing, is to charge ur battery up first , ensure all ur earth and pos cables are tight and nothing left disconnected , ie map sensor, maf by the air filter etc
Have u just don’t the belts , any work inside, ie passenger carpet footwell ???
Plse let us know how I get on