'Not having a UK credit card, I choose to transfer money to their bank'..not wishing to be harsh but you can kiss the money goodbye. Never, never, never pay by bank transfer and always use a CC as you will be protected. As the company announced insolvency after you had paid you will be one of the creditors and the chance of getting payment is slim as not many companies go into insolvency because they have too much money. Sorry to be the bearer of bad news but you will have learned a valuable but expensive lesson.
Make sure you contact the insolvency practitioners to make sure that your name is on the list of creditors.