Yeah, stick that forty quid in yer knickers for a rainy day. All the market forecasts are that the lira still has a bit to go, certainly against the USD, before any "bottoming out" is likely to be seen.
As regards Sterling, I think a lot will depend on the up coming Supreme Court decision which could push it substantially either way against most currencies, although maybe not the lira or the Chinese Yuan

In the interim, I suspect we might see a slowing down of the slide against Sterling but with the lira, who knows! It could hit five to the pound by the end of the month if it does carry on the way its going.
That was all just a roundabout way of saying I haven't really got a clue

JF