Help with Electric blankets for a Small Double bed

[chaparral]

I been thinking of changing my standard double bed to a small double bed

But i been having trouble with finding electric under blankets to fit a small double bed

Almost all the electric under blankets i have looked at seem to only do sizes of single, double or king size

 

[jpaul]

even with the double ones the heating element don't necessarily go all the length & breadth of a 4'6 bed -so need to read reviews.
- parents got one such recently - had wanted one with dual control but they are(were?) in short supply with people buying them to allow them to reduce bedroom temp , plus the cold snap.