Hi I applied for and subscribed to a £4 a month product but each billing cycle i seems to get put on a default product that costs £14.95 - anyone else?

If you have to open a new account, make sure to click the Buy button to get the discounted price for up to a few months. If you purchase from the Trial account, you have to pay the regular rate.

https://quickbooks.grsm.io/UK

If you only have a limited budget, consider switching to QBSE or other system. You may find may options in the market with a cheaper rate, including the free one.