Intravenous regional anaesthesia: An intravenous cannula will be placed in the dorsum of the hand of the affected limb and a second cannula placed in the contralateral limb. A suitably sized double cuff tourniquet will be placed around the upper arm over a layer of orthopaedic wool. The limb will be elevated for two minutes and the tourniquet inflated to 80 mmHg above the systolic blood pressure. Following confirmation of the absence of a radial pulse and capillary refill in the fingers the dose of 0.5% prilocaine will be injected via the cannula in the dorsum of the affected hand. The volume injected will be 40 ml for patients weighing less than 70 kg and 50 ml for those 70 kg and over. Once anaesthesia has been confirmed by the absence of pin-prick sensation as outlined below, the manipulation will be performed. The tourniquet will remain inflated for a minimum of 20 minutes from the time of injection. Supraclavicular brachial plexus block: The intervention group will undergo an ultrasound-guided brachial plexus block using the following technique: an intravenous cannula will be placed in the non-affected hand. The block will be performed using a sterile technique (sterile gloves, chlorhexidine spray, sterile probe cover). Visualisation of the brachical plexus will be undertaken with a Siemens Acuson X300 ultrasound machine with 10 MHz linear array probe. A view of the subclavian artery and surrounding nerve trunks will be obtained with the probe placed in the supraclavicular fossa in the coronal oblique plane. With the patient supine and the head turned at 45 degrees away from the probe. 1 ml of 1% lignocaine will be infiltrated in the skin at the injection site. A 22 gauge 50 mm short bevelled insulated block needle (Braun, Stimuplex) will be inserted at the lateral edge of the probe. The needle will be guided under direct vision from lateral to medial along the long axis of the probe using an in-plane approach. A total of 20 ml of 1% prilocaine will be injected around the trunks with frequent aspiration to exclude inadvertent intravascular needle placement. Spread of local anaesthetic will be observed in real time. Injection will be into at least two separate areas around the nerve trunks. Duration will be around 1 hour in total for each intervention. Total duration of follow-up will be until seen in fracture clinic. This will be approximately 3 to 7 days in both arms.