I thought it was bad that a neighbour about 300m away had an infinity estimate of 16mb and I couldn't get anything other than my 0.5mb. I was messing about on the address checker and now find that the odd number houses on the other side of the road from me can get 11.3mb! I could even proceed with an online order.
Puzzled by this, I realised that the odd number houses are a different postcode from the even ones. The neighbour who uses the next pole down from mine can order faster internet but i'm just banging my head against a brick wall talking to any provider.