Range of interest rates depending on LTV. 60% is cheapest
BUT no ERC nor Exit Charges
Unlimited no charge overpayments, including lump sum.
Includes 1 standard valuation for free.
Knowing HSBC there is probably some catch, but worth checking out if you need to re-mortgage
Its re-mortgage so you need 40% equity in house. eg if you house is worth £100k you could borrow upto £60k at 2.29%. Most trackers come with high penalties if you want to get out, but this seems charge free.
You could find a building society paying a better instant access rate and make out of it.