Help to buy mortgage or traditional mortgage

Hi everyone. I have a dilemma and hoping you can help! I have put an offer on a property, got the mortgage sorted and soliciters are getting on. However, a few weeks ago I had a phone call from the estate agent saying the sellers wanted to take the property off the market. I then had another phone call the next day saying they do still want to sell the property and they were just panicking because they felt rushed to buy somewhere. Last week I had a phone call from the estate agent again saying the sellers have now found a house and put an offer on it which has been accepted. This is obviously great news but I’m a bit sceptical after what’s happened. Also, the people the sellers are buying from are buying a new build which won’t be available until September, but they’ve said they will rent until then so our properties will go through. After all this I’m worried whether things will actually go through and whether I’ll be waiting months and months until I move into the property I’m trying to buy.

Last week another property came on the market which I went to look at. I loved it but the problem is it’s a new build so would need to do a help to buy mortgage because I don’t have enough deposit otherwise. The flat I’m meant to be buying is with a traditional 90% loan to value mortgage. My question is, what would you do in my situation? I’ve always been put off help to buy mortgages because I don’t like being tied to something when I have the chance to do it traditionally. However, with all the worries with my original property I don’t know what to do. I really love both properties and don’t want to be left with nothing, but the thought of doing a help to buy mortgage is worrying me.

Please help!!