If you've had so little interest, double check the price. I would instantly assume that I need to budget for a new kitchen and bathroom from the photos. Those are the most expensive rooms in a house, so make sure you're priced accordingly.
And I have no idea what the guide price statement is at the start of your blurb. No one is going to offer £420,000 when you've listed it at £380,000! In fact, £380 would be the max anyone is likely to offer (as you're unlikely to spark a bidding war). It seems a poor pricing strategy from the agent.
Pricing problems aside, I'm afraid I just don't understand the plot from your photos. Where is the garage in relation to the house? Is the garden just that narrow strip? The "gym" photo looks awful, I know it's the garage, but it isn't selling anything. Include an external garage shot perhaps?