my sol has written the above under my order sought on my E form. There are other bits down as well which I understand but the charge back I'm not sure.Does it mean if I get the house but don't have enough money to pay him off initially I can owe it to him in the future(within a set time limit) or what?
Without knowing the details, I would say that your solicitor is probably wanting to keep his options at this stage as open and flexible as possible. I don't see anything particularly wrong with this.
A charge back is an arrangement whereby one party is awarded property ( typically, the marital home ) and the other spouse has a charge on the property which becomes realisable on the happening of certain specified triggering events, such as the re-marriage of the spouse who has the property, or dependent children reaching 18.
I think you've got the general idea but can't comment any further without full knowledge of the circumstances.