5 levels is easy enough to work with.
As for currency, Pounds would be the monetary standard.
Here is a full list of British currency for others not familiar with it.
1p piece (coin) (one-pence)
2p piece (coin)
5p piece (coin)
10p piece (coin)
20p piece (coin)
50p piece (coin)
£1 coin (one-pound)
£2 coin
£5 coin (rare, were in circulation for a short time but still legal tender)
£5 note (paper money)
£10 note
£20 note
£50 note
There are thoings like the £100 note, but they are to rare to really list as conventional money.





