As others have said your phone, wifi, internet are very high - ours comes to £49 and I've just gone onto a new contract. Can you change your contracts?
Do you really need to pay for parking? Only time we ever do it is if we're away and it's easy. Otherwise, we park slightly out and walk.
How many people are in the house. If it's just two, £330 for food is extortionate. Only two here most of the time - I've been keeping an eye on our food costs and we spend £180-240 depending on how extravagant we're being and if we're entertaining.
I appreciate electric is probably more expensive, but again if just two of you, that seems a lot - we are on gas and electric but averaging £68pm, although going up.
Re: the gym, have you checked to see if any of the local schools have their gym and facilities open after school/weekends? Ours charges £14pm (admittedly you pay extra for classes and court hire, but it's reduced)!
Do you both drive a distance for work? If not, petrol seems quite high. Can one of you walk to local shops for food sometimes, can day trips be closer?
plarking petrol food