Only one of you need be a first time buyer but if you are buying a property with your partner, he will have to sell his property at the same time that you are buying. To qualify you must only have one mortgage once you have completed the purchase
Lots of hurdles to overcome re the FHF but probably the most important is to know if there is any limit on the value of the property that you are wanting to purchase. Nothing in the legislation so you'll need to look to the lenders for an answer. Most are saying £250K but there is one that has no upper limit!
You need to repay the government when you come to sell. So if the FHH amount equates to 25% of the purchase price then you have to repay 25% of the sale price. So the government are now incentivised to make sure that the house prices continues to grow!
A fee of £550 will be charged by the Administering Agent once they receive your application. This will be refunded to you if your application fails at any time, except in cases where there has been misrepresentation on fraud on your part