No water pressure and loud gurgling and tapping from loft

[Russ barton]

Hi I have for a while had bad hot and cold water pressure. At a certain time in the morning the boiler comes on and you can hear bubling coming from the radiators and much louder from the tank in the attic and like a taping noise the gradually slows down after 20 seconds, it does this circle I few times in the day ? The cold water pressure downstairs is fine, the hot water pressure in the kitchen is rubbish but in the downstairs loo it fine ? It's all a bit odd. I had my local housing association come round but was very unhelpful and didnt have a clue. Please help thank you