Charlie32
The Devil is in the detail my friend!
Check your original mortgage agreement it must give the terms. It will list the discount rate and period of the discount. Then it should tell you what happens at the end of the discount period.
Most mortgages fall back to the lender's 'Standard Rate' ( for standard read RIP OFF)
Your main problem as I understand it will be due to the fact that thanx to the American Sub-Prime situation self cert deals are very hard to get now and the chance of your application being audited is much higher. If you can't supply the necessary proof of earnings read on .......
This happened to a friend of mine recently, A freelance mortgage advisor secured a self cert mortgage with GMAC for her with a 2 year discount rate. At the end of the two years the 'normal' rate was very high. She rang them, queried the rate and they offered a further discount period, not such a good discount but 1% better than the normal rate.
GOOD LUCK!
If you don't live life on the edge then you're taking up too much room