A prisoner with a muscle-wasting condition, accused of taking part in a Palestine Action protest, claims he has been forced to crawl around Wormwood Scrubs jail - including to get medicine - because of a lack of treatment and a suitable wheelchair.

Umer Khalid, 22, from Stockport, who has limb-girdle muscular dystrophy and is awaiting trial for alleged involvement in last year's break-in at RAF Brize Norton, says he was left in his cell during a fire alarm and went 26 days without a shower while waiting for a shower chair. He compared his predicament to an injured stray dog he saw in Pakistan, noting the dog at least elicited sympathy - something he feels is absent in his own case.

Khalid says the muscles in his arms and legs have wasted away, leaving skin hanging off his bones - a description confirmed by recent visitors. He waited weeks for crutches, which he is now too weak to use, and then for a wheelchair that doesn't fit in his cell or the corridor. He fell out of it twice trying to get into his cell, and was later told it was only for visits and appointments, forcing him to crawl for medication.

Before getting the wheelchair, he missed neurologist and physio appointments because he couldn't get to them, and has only seen the physio once this year. During a fire alarm on 23 April, he claims prison officers saw him in bed and left, despite him being in too much pain to press his emergency buzzer. A neurologist recommended supplements a month ago, which he hasn't received, and he hasn't been given the high-protein food he needs.

Khalid, who was diagnosed with muscular dystrophy in 2014 and was part of a Palestine Action-affiliated hunger strike that ended in January, alleges healthcare workers accused him of exaggerating his condition. He is demanding proper medical treatment, a suitable wheelchair, and the release of his medical records to his legal team.

His mother, Shabana Khalid, said: "He showed us his legs and his arms, he's just like a skeleton with skin hanging off him and the prison want to say he's making it up. It's horrific; there's nothing we can do but get angry."

A Ministry of Justice spokesperson said: "The Prison Service caters to all disabilities. All prisoners' needs are assessed when they enter custody - with arrangements made, and appropriate action taken to ensure they are met."