Look no further than David the Decorator he has the men the knowledge and the method and can also blend the repairs seamlessly into your existing floor. He'll also offer a 30 year guarantee on such works.
Email is david@beirneandsons.com

Hi there i am a handyman based in wandsworth feel free to call me on 07933043515 kind regards

Our wood floors had large gaps and were filled in with pine slivers which work great - prior to that they were filled with a mixture of sawdust and glue which looked good for a short time but eventually fell down under the floorboards. You can see what the pine slivers look like here:http://periodprojects.co.uk/wood-slivers-southampton/ - ours still look good four later later and the house feel warmer too.

We had a large one of these made to cover all the gaps in our floor boards

http://www.crucial-trading.com/rugbuilder/

Hi flatwhite,
Can recommend Peter. He is a carpenter/handyman/decorator.
handymanpeter2013@gmail.com
Thanks

I need to get some gaps filled in the Victorian pine floorboards in my house. Does anyone have any experience of companies/tradesmen that do this, or of the best methods/materials to use?

We don't need the floor sanded or made to look perfect, just looking for a few holes and sharp edges to be patched up.

Many thanks!