What does your mortgage contract say about variable rates?

Apologies if this has been discussed before (in which case delete or merge this) but I can't see anything on it.

I'm just curious as to what the different lenders' mortgage contracts say about variable rates? I have a BoI offer letter and contract (which was for two years on a fixed rate thereafter defaulting to variable) and it says this:

PART 5 - THE GENERAL CONDITIONS

...

6. Variable Interest Rates
(a) Subject to clause 6(c), at all times when a variable interest rate applies to the Loan the interest rate chargeable will vary at the Lender's discretion upwards or downwards.

...

(c) Notwithstanding anything else provided in this Offer Letter, the varied applicable interest rate shall never, in any circumstances, be less than 0.1% over one month's money at the Euro Inter Bank Offered Rate (EURIBOR)

Click to expand...

Is this standard stuff?
Could it be argued that this is an unfair contract?
I think that this is one of the two prongs of the IMHO/Ross Maguire court challenge to specific (?) mortgage contracts?

My new mortgage contract withKBC is probably even worse
"
6 Interest - variable rates
6.1 The Lender may from time to time vary the rate of interest applicable to the Loan.
6.2 <generic statement about making the borrower aware>
6.3 <generic statement around when the rate comes into effect>"



My old BOI documentation when I came off my Fixed period onto my variable in 2013 states
"
5 If the selected rate is a variable rate:-
5.1 the interest rate will vary at our discretion upwards or downwards
5.2 the General Conditions in the Mortgage Loan Offer Letter concerning variable rates of interest will continue to operate"


That's it - they all have to power to change it any time they want, and all I can do is switch in this case(or pay it).