Suppose the pound depreciates sharply against other leading world currencies. How might the key policy objectives be affected?

Objective Impact?
Growth
In principle the weaker pound will make UK exports cheaper in terms of foreign currency and imports cheaper in sterling terms. Therefore there should be an increase in X and a fall in M, increasing Ad and promoting short term growth. However, PED for both may be low in the short term, because of factors such as loyalty to suppliers and contracts, and export performance will depend on the nature of exports and export markets. Hence there is a risk that, especially in the short run, the value (in total) of imports may actually rise sharply, damaging growth.
Unemployment
As noted in growth, in principle, exports should rise and firms competing with imports should also see an upturn in demand, but it depends on many factors as noted in growth. Import-dependent firms, for example may face job losses.
Inflation
There should be unequivocal upward pressure on inflation. The decrease in Px will increase demand in export sectors and the rise in Pm will create cost-push pressures elsewhere.
Trade balance/current account
Should in principle improve in the longer run, but see the section on growth.