Longer distance travelling on power chair - breakdown

Hi there! So the short question is:

Do you know what would happen if your power chair broke down and you were far away from home? In terms of motobility breakdown cover. 

I've been on the phone for nearly 2 hours trying to find out if the breakdown cover supplied with my motobility power chair will 'work' if I travel from North East England down to London for a day. 

I've had to use the breakdown service 3 times this last 2 weeks (long story but chair being fixed) and they have been great. One time I had a few hours to wait but they have been great on the phone and sent lovely wheelchair friend taxis to whisk me home. But I've only been local. What happens if you are further afield. 

So far I have discovered:

Outside of UK = definitely not covered (as expected) 
Inside 25 miles = 3 people in call centre THINK this is the limit for definitely being recovered 

Over 25 miles in UK?   = still a mystery! 

I'm cautious perhaps.... But after so many breakdowns I really feel I can't travel without a back up plan... 

What do I do if in London sat in a chair that won't take me anywhere?