Noticed a discrepancy in usage - after 2 years. What are my rights?

riva

I've been paying by direct debit - which kept increasing over the past few years. I thought it was due to general increase in cost of utilities. I recently logged in for the first time. Noticed that there was an incredible spike in use (>10x normal usage) around 2 years ago over a period of 6-8 months (meter is read every 6 months by Thames). Besides that, usage is average and there's a pattern of usage. There were no leaks in my property, no renovations etc. I live on a red route (not sure of relevance here), road in front of my flat is broken and dug up at least 2-4/year, every year. I believe that one of the digs must have caused a leak. 
What are my rights here? What should I look out for etc? I've written into the correct dept (based on what the person on the phone told me) and waiting to hear back but thought I should perhaps ask on here as well in case there's any helpful info that anyone can help me with.

QrizB

Where exactly is your water meter? In the street, in your garden, in your house?

riva

On the street

QrizB

riva said:

On the street

Ok.

The pipe between the meter and your house is your responsibility (or your landlord's, if you rent). If you know who damaged it, you might have a claim against them.

Do you know who damaged it?

riva

No, I only noticed this discrepancy recently. There's always road works outside my flat. Suspect it won't be too hard to find out who had permission to dig the road out. I'm wondering if it'll be worth my time. My typical usage is between 240-300 litres/day. During that period, it was averaging 2840 litres/day for 6 months and 750 l/day for another 6 months.
I now know to always check for this. Never occurred to me before.