Southend is no problem!

No wiring to change mate. From standard there is a multi plug that pops onto standard lights they have wiring and relays internally where twins don't. When you buys twins you get a wiring harness that has relays and a multi plug converter!
All you should have to do is unplug the wiring harness loom and they they multi plug should be there to pop on the lights. Should be a 20 min job.
Hope that makes sense!