Plausible additional mortgage borrowing ideas!

[Dunk130TC]

I've got an fixed rate offset mortgage (5%) with an ability to draw another 50% should I need it.
I want to take out an additional mortgage with my provider on my existing house to take advantage of the base rate +2% they're currently offering, and use the proceeds to put against my 5% offset and decrease my net interest payable.
(I can then take advantage whilst rates <5%, if they rise I switch the borrowing back to the 5% and have it fixed.)

The issue is that they want a reason and evidence (due to now being responsible lenders!) for the additional advance which clearly I haven't got as a only want the funds to reduce my existing borrowing! (all income multiples, LTV are fine)
What grounds can I use to justify the borrowing c.£150k? With no evidence and no intention of spending it !
For an extenstion they want plans and planning permission
Loan to family member? (Which may not be made)
Money to invest? (Opportunity may not be right and therefore won't use funds)
Any other credible ideas to allow me to save £400 a month, without being convicted of mortgage fraud?

Thks,

Edited by Dunk130TC on Saturday 4th December 14:33

[Sarnie]

How about telling the truth?

[jas xjr]

tell them you want to buy a car

[Sarnie]

Lets say you find a plausible reason that they accept.

And then just after completion, the same amount paid off your offset account.

Hmmmm.

[LC23]

jas xjr said:

tell them you want to buy a car

This is what I did. I was actually buying a car however.

[Ungarsee]

How about you're looking to buy a holiday home at auction but need liquid cash as at auction you have to exchange on the day and complete with in 28 days.