Floor insulation

You could try the reflective foil/foam on a roll stuff, similar to that used once used behind your radiators.

https://www.toolstation.com/ybs-general-purpose-thermawrap-insulation/p90532

If you go down to Product Details it actually says:-

"use it anywhere from roofs, walls and floors to motorhomes"

Colin

There are lots of similar products available on eBay. If you do choose to go down that route don't forget to insulate the floor under your bench seats and in the cupboards.

nth - I lined the lockers (underneath the nearside seat and the n/s bed) with those interlocking 'foam' tiles that are intended to be used as awning carpet.  I bought a load in the sale from Halfords and then didn't like them because they sprang apart when used on the uneven floor in the awning.  I put them down - not for insulation - but to stop the wooden flooring becoming scratched. They were very easy to cut to fit with them being individual tiles and have made a very neat (and colourful!) job.

Thinking about it, though, they would make excellent insulation for the floor which the OP might like to consider.

Buy a good pair of fluffy slippers, much cheaper and much less work

I am trying to envisage when feet would get cold? The floor of any caravan/motorhome is already insulated. Are you not warm whilst the heating is on? If you leave the heating off overnight it can get a bit chilly but in those temperatures we wear a pair of socks in bed so certainly don't notice a cold floor should we have to get up during the night. 

David

If the OP was going to lay the carpet on top of those tiles don't you think that the extra height would inhibit the opening of some of the cupboards such as those under the sink and cooker etc.

I have replaced the original carpeted in the caravan with a cut off from a carpet dealer and used some of it to insulate the floor under the seating and in the cupboards too.

 Note that the OP has a 2006 van.  Like our 2008 van it has a lower level of insulation than vans made since 2009.   Our floor  can be cold sometimes, early or late in the year, but having Alde heating does help a bit.

When we feel it is cold, we put a blanket down over the carpet where we sit.

Kj

I am basing my comments on vans we have owned going back beyond the age of the OP's van. All of our vans have had blown air heating and the vents exit at floor level which tends to keep the feet reasonably warm.

David

"If the OP was going to lay the carpet on top of those tiles don't you think that the extra height would inhibit the opening of some of the cupboards such as those under the sink and cooker etc."

Good point nellie.  It would depend on the van.  In ours, there's more than enough room under the sink cupboard doors to do it - the tiles are only about 1cm thick.

We're spoilt, though - having underfloor heating in the area we walk on

"We're spoilt, though - having underfloor heating in the area we walk on"

and that is why i cant afford a new caravan or a reasonably good 2nd hand one, too many bells and whistles which have pushed up the prices into the silly money bracket.

When we started out we lived in Scotland and ventured out hail snow or blow with just blown air heating, which went off overnight, and lots of thick socks, furry booties and a wooly hat to sleep in if things got really bad. Now i know why lots of sights including this club are installing metered EHU  , have to confess we are softies now and dont often venture out in the cold months unless it is to overthere, but we do treat ourselves now to a couple of hot water bottles