Just to round this topic up for anyone having similar problems.
I can confirm that regardless of what is said about there being no need for a pump, my system does have one. I checked it as Tony suggested and it is working fine. I must commend Lockgate stoves for suggesting solutions for the lack of fuel problem via e mail, when these did not work I was contacted by an engineer who talked me through the process of stripping down the regulator and clearing the internal valves and filters.
Stove now works perfectly.
So I would recommend anyone with stove problems to make contact with Lockgate they have obviously upped their game for customer support, I have nothing but the highest praise for them.