@bledi007 Are you on the £25 always on goodybag? if so, have you used up the first 20GB of mobile data? As the always on goodybag is designed to give you 20GB of UK data at full 4G speeds and once you used up the 20GB then you will continue to get unlimited data allowance at a reduced speed (384KB) from 8am to midnight. From midnight to 7.59am you have an unlimited data allowance at full speed.
However, if you haven't used up the first 20GB of data or if your not on the always on goodybag Please check the giffgaff network status in your area here https://giffgaff.com/coverage-and-service and enter the post code .
This should give you display any local issues, including planned work, as well as indicating signal strength (2G , 3G & 4G) & outages.
Remember the website service checker is updated hourly and may not display any issues at the precise moment.