Shopping around for fresh introductory deals may save money even with penalties and legal fees. Mortgage brokers are available to help with the sums. Since 1995, however, the government has reduced its assistance if you miss a payment through illness or injury, so an older, cheap mortgage may be worth hanging on to.
If you do change, your mortgage broker may try to sell you payment protection insurance, which covers any payments you miss through illness. There is no obligation to take this and even if you do, it may be available more cheaply from another provider.