Dont need any specific type of transformer for a specific type of monitor.
The only things that matter are:
1) Input voltage
2) Output voltage (usually the same as the input)
3) Output amperage (usually at least 1 amp, don't need more than 2A)
Bob Roberts sells 120 in/out 1 amp ones for US use, but you probably have 240 volt ones in the UK? (I dont know.. you need to check)