Fix dishwasher - identify issue & repair if poss

We have a fairly old Bosch dishwasher (was here when we bought the house) has been working fine but suddenly won't do a full cycle. Will sound like it is starting but then stops and doesn't go through. Potentially sounds like water isn't able to get through so maybe a block somewhere. Hoping to get someone round ASAP to take a look and fix if it's not a major. If it appears to be a replace rather than repair, can still pay for your time. Please provide quote for investigation time. Obviously ASAP is ideal but please still respond if you can't get here today but in next couple of days.