We recently followed up a Reader Recommendation from the April 6 Tips column and discovered that fuller details changed the picture somewhat. A letter from Peter K. Wilford in England pointed out that the $115 a day per person charge for the Rolls-Royce tours assumes a party of four. If fewer passengers go, the cost would be higher, to meet the daily hire charge of about $375 that includes a chauffeur, all meals and accommodation in a bed and breakfast. An upgrading of sleeping arrangements would also raise the cost. Readers may contact Wilford at 35 Robin Lane, Hilldale, Parbold, Lancashire WN8 7BE, England.