1. If you owe any money at all on the landline at the date you go bankrupt then the account becomes a debt in the bankruptcy & you will almost certainly lose it. You need to make absolutely sure you don't owe anything by making an advance payment (which needs to cover any line rent due as well as calls) just before going bankrupt. Even then, the Official Receiver will almost certainly notify the phone service provider that you are bankrupt, & the provider may then decide to cancel the contract. This used to be the situation with BT, but I don't know whether it still applies.
2. Your internet connection is presumably broadband. Again, make sure payments are in advance before going bankrupt. Normally, the cost of broadband is not allowed by the Official Receiver as necessary expenditure. You would, if necessary, have to argue your case with him based on the use that is made of it. However, as far as the cost is concerned it could be regarded as coming out of your �surplus� income if you have to make any payments to your creditors. The same problem may arise as with the landline � i.e. the provider may decide to cancel the contract.
3. Assuming the computer was not extremely costly and nearly new, it will not be taken because it would have no significant value.
4. Your liability for the joint loan would be included in the bankruptcy; the creditor would continue to pursue your ex, who is jointly and severally liable with you for the whole of the debt. If your ex wanted to claim it back from you on the basis that you had had the money he would have to go to Court to try and get a CCJ. I don�t know whether he would succeed � it seems to me unlikely because there is (I assume) no evidence that you agreed to be liable to him for the debt, and your legal liability has been wiped out by the bankruptcy.