Definitely worth checking and comparing what is available in the market including intermediary deals as well (we found that a Halifax intermediary deal was the best available on our last remortgage and much better than their standard customer deals)£2K fee is pretty high, if Nationwide will do the same sort of rates consider switching to them. They do £999 product fees on their fixed deals.
Other things worth factoring into the calculations include any extra interest payable for adding fees to the mortgage loan amount as well as any exit fees (Santander for example typically take a £225 exit fee).
Also what the ERC fees are if there is a chance you may want to exit early if rates were to come back down mid way through for example.
Overpayment allowances may be a consideration too which would reduce the interest applicable.
Using a mortgage comparison tool helps massively to factor in all of the above for a real cost comparison (we used Mortgage Smarty although there are no shortage of apps)