Where in the UK is area code 0151?

0150 is not an area code, but there are several area codes which begin with 0150 in the United Kingdom:-

In England:

01502 Lowestoft

01503 Looe

01507 Alford (Lincolnshire) / Louth

01508 Brooke

01509 Loughborough

In Scotland:

01501 Harthill

01505 Johnstone

01506 Bathgate