london crash european union without deal would cause major problems britain health service risk chaotic disruption medicine supply accord report tuesday nuffield trust independent health charity also warn brexit without deal future relations eu would lead worsen staff shortages national health service nhs could create particular problems healthcare northern ireland treatment program rare serious diseases design work across entire island ireland scenario uk leave without deal would cause extensive problems nhs would risk chaotic disruption supply medical products rise price would push hospitals deep deficit report state many different part eu law eu institutions play important role enable care deliver standards see today suddenly end replacement would serious damage already strain british nhs warn chime concern pharmaceutical company already draw plan protect supply chain stringent medicine regulations mean manufacturers face multiple brexit uncertainties potential need retest drug ship across border transfer product licence different jurisdictions brexit deal risk chaos drug supply report warn